Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c24d01ae7c02296…

MALICIOUS

PDF

80.0 KB Created: 2020-12-22 03:18:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1e9dd5922ae4bd8cb35b23655190b16 SHA-1: 1d75b4a54bc73b08a6b6e464bb0df13f96379bfe SHA-256: 4c24d01ae7c02296596f2edcd63c67c5f0cdfee1ddbf2f742f7c69e716f043e1
234 Risk Score

Malware Insights

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

This PDF file is flagged as malicious by multiple heuristics and an ML classifier, indicating it likely hosts malicious content. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'loctite 577 msds pdf', potentially to disguise its true malicious intent. The presence of many external PDF links suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=loctite+577+msds+pdf
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/tojajudo-puxifatalal-kiperipol.pdf
    • https://cdn-cms.f-static.net/uploads/4483587/normal_5fada9c316d15.pdf
    • https://cdn-cms.f-static.net/uploads/4404745/normal_5fd7dc39e2f8c.pdf
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f882fdaacde7.pdf
    • https://static.s123-cdn-static.com/uploads/4374188/normal_5fce8b23ae260.pdf
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/bunup.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bamudepekepa_setumazowido.pdf
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/lisajatanabofiliwuw.pdf
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f89ed617faa8.pdf
    • https://cdn-cms.f-static.net/uploads/4449177/normal_5fad871aa22eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bce56921-a7d5-4270-9254-552633b7484e/vusan.pdf
    • https://uploads.strikinglycdn.com/files/66da6078-9927-448a-876a-49a76322d3f5/41371735303.pdf
    • https://s3.amazonaws.com/takurugilij/hotel_guest_book_template.pdf
    • https://uploads.strikinglycdn.com/files/3c056385-8473-4dc5-bb18-d8e0166d8fef/95137532297.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_off0000f4c9.bin
dd70118d156e2da893873648642523d4bc41217eb877a562189d96a01e0c51b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 5108 bytes
font_01_sfnt_off00010638.bin
fcee4caa590cd5e4bdbf932627b4196dc1fcc4c19802300fe1f3f17499ce0640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 15076 bytes

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