Malicious PDF — malware analysis report

Static analysis result for SHA-256 2980ac3294711003…

MALICIOUS

PDF

85.9 KB Created: 2021-02-24 09:01:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c28a3634365f93ed145bd4279b42c7d2 SHA-1: d94793e87882122941adfa45537ecc007daf74a8 SHA-256: 2980ac3294711003731b8919635a333fddbf84106140a188a4ee2a5ac926c6f8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. Many of these links point to disposable domains or subdomains, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/aws?utm_term=short+english+books+for+beginners+pdf PDF link annotation
    • http://help-lnstagramcopyrights-verify.com/t_mobile_high_speed_home_internetkg9tm.pdfIn PDF document text
    • http://5coupon.info/oracle_12c_client_installation_on_linux_downloadekyhp.pdfIn PDF document text
    • https://jaloteke.weebly.com/uploads/1/3/4/0/134096083/zigugiwevemoxoguje.pdfIn PDF document text
    • https://beserozufem.weebly.com/uploads/1/3/4/8/134864657/6700722.pdfIn PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/taras_natidasofuda_dirujukuwuxovoz.pdfIn PDF document text
    • https://raligeledow.weebly.com/uploads/1/3/4/8/134893256/sumadipe.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/lixipamibusivuvif.pdfIn PDF document text
    • https://rababavuve.weebly.com/uploads/1/3/1/8/131871532/reririk.pdfIn PDF document text
    • https://xekigumi.weebly.com/uploads/1/3/0/7/130776031/2319596.pdfIn PDF document text
    • http://zathkatow.xyz/briggs_and_stratton_engine_parts_south_africajze0m.pdfIn PDF document text
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/dd7b43beb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xovojiga.epizy.com/facebook_instagram_logo_vector.pdfIn PDF document text
    • http://fekobovovexi.epizy.com/55191393219.pdfIn PDF document text
    • http://poresiz.epizy.com/32000900090.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 5188 bytes
SHA-256: 1a80cbfe031deabbc8254b97846a5f5155087ef306b97dbd527cea3de4ebcc54
font_01_sfnt_off000117b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 10832 bytes
SHA-256: 20614718bd6ecbda356dd1a3fa84095def71508c6af52f42214b682f603dfa9f
font_02_sfnt_off00013c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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