Malicious PDF — malware analysis report

Static analysis result for SHA-256 490336a0201af96c…

MALICIOUS

PDF

86.7 KB Created: 2021-04-19 01:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d7e27f3455a9d5cea62416ac50de4604 SHA-1: 23d14e96b3d24559776195fe57d72655ce90e843 SHA-256: 490336a0201af96c00ec88311679f6f54e1d9cf353f6cce19bdd548eb2fd4a01
206 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting, and one primary URL that appears to be a redirector. The malformed stream length heuristic suggests an attempt to hide malicious content within the PDF structure. The document body, though heavily obfuscated, contains text related to a generator manual, likely a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

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
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://xezojetit.ru/strik?utm_term=powermate+5000+generator+owners+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470024/normal_602a01fdc8ae6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490370/normal_5ff2118c7bf39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459177/normal_5fdc0fcd73a60.pdfIn PDF document text
    • https://cdn.sqhk.co/zavilisuga/igfZ4gj/reveziretolitiwuvozolaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393641/normal_5ffbcdb9c2491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_602eb62cdfab7.pdfIn PDF document text
    • https://cdn.sqhk.co/waxusuxagaki/WYniihf/52024272607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_606d1020ee1f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_6028eff4b38e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lubaxekivixoze.rf.gd/how_to_write_a_daycare_business_plan.pdfIn PDF document text
    • http://ponirex.epizy.com/53343480061.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_e2acd4723ca5491d925530755b24f92e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/wototodejotowa.pdfIn PDF document text
    • http://wokezafuvix.epizy.com/spongebob_scientific_method_worksheet_answers_part_1.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_c8c264ca57e94142a67596c5a880a819.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/90221898952.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_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 5364 bytes
SHA-256: 85b3719ceb3df98ceab399a733f159584b2cd8ab34ec9b473c848abe149a739e
font_01_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 13308 bytes
SHA-256: 7ce09485f38665ffb593a671734b24404ab8c90a479aca5b4943ef101f23eaee

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