Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9a61986fb15c1c…

MALICIOUS

PDF

95.0 KB Created: 2021-03-23 18:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a70900bb5068b8a7fc163e7e47bc3ae3 SHA-1: 8e7ae8aa1c7a23decf3328eee3a741423d3437c7 SHA-256: ac9a61986fb15c1ca089ef80a5652ee7f3ed28d0559827d18f978f864364033e
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document is identified as malicious due to multiple heuristic firings, including links to known malicious redirectors and suspicious domains. The document body, though obfuscated, contains text related to 'Cisco amp log format', suggesting a lure to disguise malicious links. The presence of numerous embedded URLs pointing to disposable hosting and suspicious domains indicates an attempt to redirect users to malicious content or phishing pages. The 'SE_CLICKFIX' heuristic suggests the document may also instruct users to execute commands, further increasing the risk.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=cisco+amp+log+format In PDF document text
    • http://lnstagram-support.live/hexa_block_puzzle_onlinei2jmf.pdfIn PDF document text
    • http://prizinsta.online/3101744467562iy6.pdfIn PDF document text
    • http://abanca-electronica.com/como_hacer_un_archivo_con_fotos_desde_el_celularb99hh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504791/normal_5fcf7c6d7a467.pdfIn PDF document text
    • http://leftoutclub.com/rozibo3lalg.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/6jd4icf/33703530207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476126/normal_5fe11b73ea0ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365612/normal_5ffb18e3ab22a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5fec8232da78a.pdfIn PDF document text
    • http://appless.space/gowiveriz75ifo.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/jfoicbZ/gupuvadudiwozosivilajorid.pdfIn PDF document text
    • https://cdn.sqhk.co/dujuxafetot/f3oagfn/chrome_browser_for_windows_server_2012.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/mieFUez/okay_madam_2020_sub_indo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365660/normal_5fc9e2c34b725.pdfIn PDF document text
    • http://get3creditscores.info/zatuginizolirojnbd74.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/fevogolepobanakisufbln2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_304ebc334972457dbacc3f5a2e1543ce.pdf?index=trueIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_688599c5390c4638b5d6835a532ea6db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/bhaiya_movie_ringtones.pdfIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_f3457de9a0c945bc81ec470037ff7048.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuses/aluminum_sheet_roller.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_de63852afdbb46649457affb305f9884.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_ddc5f582393b4cabb18ffce08c69fbe3.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001347b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347B 5240 bytes
SHA-256: a4a67817bb61092969bc6df4c5e3ca7d0cafe4cafcc058d44ff7dba020ed716a
font_01_sfnt_off0001463d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463D 11692 bytes
SHA-256: 61ff565bd309a5bcaab36c7dfdb1a41b995b2c9a28e6eea6d5352d4f96408fbc

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