Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c56d4564862de1…

MALICIOUS

PDF

73.5 KB Created: 2021-06-01 02:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb1f77f9f08b54d5f89132e8a98c6ac9 SHA-1: aefb534b56beff8d23f9adc221fad24231614919 SHA-256: 75c56d4564862de151b6cf6ff5e9f9d2c5717e2767c35bdad7364c6e5e742b88
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a suspicious domain. This suggests the document is designed to redirect users to potentially malicious websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/pbw?utm_term=atkins+physical+chemistry+11th+edition+citation
    • https://cdn-cms.f-static.net/uploads/4486060/normal_60561be523e8d.pdf
    • https://xijozidirosem.weebly.com/uploads/1/3/4/7/134712871/153cb061dd5c66.pdf
    • https://cdn-cms.f-static.net/uploads/4367959/normal_60430a1ecf54b.pdf
    • https://cdn-cms.f-static.net/uploads/4401546/normal_5fe9b8ac8689f.pdf
    • https://sarotokatot.weebly.com/uploads/1/3/2/6/132682281/2873993.pdf
    • https://static.s123-cdn-static.com/uploads/4374196/normal_5fec724003c95.pdf
    • https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/nonim-nukawepox-finanabawoxokoz.pdf
    • https://cdn-cms.f-static.net/uploads/4367687/normal_606e20fbbbdd0.pdf
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/rukimifixatale-jonazukap-gutusolanon-bewunokamegoxa.pdf
    • https://static.s123-cdn-static.com/uploads/4460686/normal_5fee04569d85a.pdf
    • https://sixusiwof.weebly.com/uploads/1/3/1/4/131454093/7224700.pdf
    • https://nujodobenume.weebly.com/uploads/1/3/4/4/134441993/6927949.pdf
    • https://mudikelupiviw.weebly.com/uploads/1/3/5/3/135300608/7812355.pdf
    • https://cdn-cms.f-static.net/uploads/4479436/normal_6056656b1166e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://didaneguk.pbworks.com/f/69852545501.pdf
    • http://midevodimu.pbworks.com/f/how_to_say_please_find_attached_in_german.pdf
    • https://uploads.strikinglycdn.com/files/ae1cb966-543c-4350-a3f5-d52d8c3bfea4/how_to_connect_turtle_beach_stealth_600_ps4_to_pc.pdf
    • http://degenazi.pbworks.com/w/file/fetch/144431610/88919338521.pdf
    • http://lakebimutep.pbworks.com/f/example_of_recommendation_letter_for_phd_student.pdf
    • https://uploads.strikinglycdn.com/files/cb8cb93c-1ad8-4300-8798-ca32936d6a8e/kexovuzimepafuxipe.pdf
    • https://uploads.strikinglycdn.com/files/be5ebac0-dbf6-4b8d-8279-0f3bcbd9fe01/cuando_se_puede_embarazar_una_mujer_irregular.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19c.bin
e63b0e9ff22fb2a218ad1488b435c4defbc372c0a4c7db31c3743a52448adc39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 5520 bytes
font_01_sfnt_off0000f445.bin
e52671a359feab251961ba439d2242e5b05b02470bb9ca293fa8b1e6890d2598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 10668 bytes

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