Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0dd11afd049e43…

MALICIOUS

PDF

74.7 KB Created: 2021-05-21 03:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5c5a7427164289a7ba4678ab3236eb76 SHA-1: 81d2f786e6630a58f01a433903e799a62bd8eb70 SHA-256: 6d0dd11afd049e43ecc90c5f1171b7e7f1f7d8dae291b3c4c793037429db06ad
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/strik?utm_term=samsung+chromebook+stuck+in+demo+mode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453719/normal_601cdcf40cd18.pdfIn PDF document text
    • https://jajipovel.weebly.com/uploads/1/3/4/5/134527293/5240132.pdfIn PDF document text
    • https://ribafiligizeki.weebly.com/uploads/1/3/1/4/131438260/gumezimilewox.pdfIn PDF document text
    • https://bireguvax.weebly.com/uploads/1/3/0/7/130775683/dodesubef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_604da0e859e61.pdfIn PDF document text
    • https://teguvazotumeli.weebly.com/uploads/1/3/4/0/134041540/6855509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_6048f2b044f6f.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/22f1a488e7dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461498/normal_6054fdec40eff.pdfIn PDF document text
    • https://limazosit.weebly.com/uploads/1/3/1/3/131380555/24c0d793f500b37.pdfIn PDF document text
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/popezizol.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/numegubowalonan/lonely_together_english_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/zewatudimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98de2b9-0968-4e26-85fd-81f36e49f893/go_for_no_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3723e915-3dc3-4bb3-a52e-921e20e32c89/taco_bell_chipotle_sauce_nutrition.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_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 5628 bytes
SHA-256: e9322aa724a978f6737cb09eb4b8f785bf5c35cbf6e7224d3c8e69d816729524
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 10708 bytes
SHA-256: 0b07a642c24c367efa8831a58656737db217c2a2dab68d28b81c184727315e98

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