Malicious PDF — malware analysis report

Static analysis result for SHA-256 68123a11993e556f…

MALICIOUS

PDF

64.8 KB Created: 2020-12-22 14:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dcfe59eac993eaed34f613a643683254 SHA-1: 9b491dbb5e61276113f07b71c8cc33562730d022 SHA-256: 68123a11993e556fbe8e8eccc523c38822561371508077c6ea4c9c68dbbc5aba
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link-farming or phishing operation. The primary URL observed is 'https://trafficel.ru/aws?utm_term=excel+vba+workbooks.+add+template', which is likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafficel.ru/aws?utm_term=excel+vba+workbooks.+add+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479675/normal_5fcedbf900484.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/9136223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f89b9a39a45c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5fae17bf5eb03.pdfIn PDF document text
    • https://mixofugu.weebly.com/uploads/1/3/4/3/134351041/sifenose.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/54efed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_5f8dc275c2f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_5fad60391f91d.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/jibuxosumil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdc79c85e71df64d6bd9c29/t/5fdd2c00892c8943b08f3939/1608330241144/don_t_starve_pocket_edition_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae99f2a-0063-4ec7-a486-040b89557d0e/dufaliginivojumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce1a3f0-de7b-4390-8b03-cdf76e3bc27e/68645726945.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_off0000bf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF33 5632 bytes
SHA-256: ae3e993e8b3f5cf6c30593edf6121009a09dae9f256fca7cc0a201c206afc317
font_01_sfnt_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 10572 bytes
SHA-256: 3f5867bf6d0b8bab22a0f6fe07ac31d52cd5220927d095eb5271ab133d95aa6c

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