Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc571d1a1a279fb…

MALICIOUS

PDF

61.3 KB Created: 2020-11-20 11:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0024e1283b76d5478587e98a517aa7e2 SHA-1: 465ebd352547aebe955250b384225d88d0bab1c2 SHA-256: 9cc571d1a1a279fb17e8bbd266de547f6b8b56b0b78544d4b195f83b5d525059
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector. One prominent URL, https://traffine.ru/strik?utm_term=manual+de+nefrologia+schrier+pdf, is flagged as a known malicious redirector. The document body is heavily obfuscated and unreadable, but the presence of many external links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://traffine.ru/strik?utm_term=manual+de+nefrologia+schrier+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5fb777b08a39a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_5fa0580d39bec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5f8bd58fda869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f90a8b53867d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464735/normal_5fb042a411375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_5fa3bc867287e.pdfIn PDF document text
    • https://firupewuvub.weebly.com/uploads/1/3/4/3/134330425/db7680489c6a072.pdfIn PDF document text
    • https://zopoxetofosifa.weebly.com/uploads/1/3/4/8/134863155/bewekogeru.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/resixexi/82806429575.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/general_characteristics_of_cephalochordata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260b2a31-3644-45a7-8c62-1cc161eef9e6/31935744304.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/bitcoin_mining_algorithm.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_off0000b237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB237 5424 bytes
SHA-256: 59e66e97fb227dec703f8b9434d7f4ef0bdb79cff99d5bcd36f099ecb3d02bde
font_01_sfnt_off0000c4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B5 10324 bytes
SHA-256: 3b0f8dfdec71647649f06db835bb3f33cb484ab238d368899c870803b2e32337

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