Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b6cb29351c2c4a…

MALICIOUS

PDF

63.4 KB Created: 2021-02-15 05:27:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 99314f307aa59920444cbb248f9365c0 SHA-1: 9b28b909caedb9a1e8719ea19f08ab5bc0476a3b SHA-256: a6b6cb29351c2c4afaf0e067a3dccecfb869d3b4e57d39560d4d438b28a7de0d
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are likely part of a link farm designed to host malicious content or phishing pages. The presence of a critical heuristic firing for 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Mps home infinite campus', suggesting a lure for users seeking information about this service.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/123?utm_term=mps+home+infinite+campus In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_5fe70c05edd68.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/ehg0jii/38385948202.pdfIn PDF document text
    • https://dapapakutuluj.weebly.com/uploads/1/3/1/3/131384169/fikuzojepamafiv_pipapaneruviti_varotis_tofibasinenupa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464327/normal_5fe5b1106560a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_601a13a4abf6a.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/1jj2KGi/sesubeliwi.pdfIn PDF document text
    • https://cdn.sqhk.co/gerukoso/c5jgcha/idle_coffee_corp_mod_apk_1._0._226.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/DgfoVNe/konirej.pdfIn PDF document text
    • https://cdn.sqhk.co/kisudosus/gfgg1ha/nasal_congestion_treatment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_601bc7109d079.pdfIn PDF document text
    • https://cdn.sqhk.co/sekijebasazi/jahdVjf/ponisifirovajag.pdfIn PDF document text
    • https://fusopozosasotex.weebly.com/uploads/1/3/4/4/134477759/roxijuba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/hybrid_beamforming_massive_mimo.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/internet_manager_chrome_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/css_transform_scale_width_and_height.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB4 5132 bytes
SHA-256: 754fce04a687941c5af29fc9867a1dcb4fbce9558ba236a040cb78690530fbdc
font_01_sfnt_off0000cc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 10248 bytes
SHA-256: d03e9695b6678d8860c8be9c56f0a3944a4c2e8f25c959a594e4e796befb28a8

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