Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf0bed967bdfdc3…

MALICIOUS

PDF

71.7 KB Created: 2020-12-29 19:33:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0f0d21097a199ea750e8b5f74f3ed8a6 SHA-1: 974349215db581710cec2c7a1b67048a9aebc3e2 SHA-256: eaf0bed967bdfdc347789f9f8cc32d71bce7943195dec2bbb64e1ec9e799564c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs indicates an attempt to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=nika+revolt+theodora PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5fe41f65d28ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f932405cf559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481528/normal_5fd315dcb4898.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/wodobujewesam-podiwibipe-rabuvexedi.pdfIn PDF document text
    • https://zixokamewi.weebly.com/uploads/1/3/4/3/134386319/zijimo.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/xoxozid.pdfIn PDF document text
    • https://juvosibizojeguw.weebly.com/uploads/1/3/4/0/134040958/kobizafijud-rowavibadajak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_5fb4fa934671a.pdfIn PDF document text
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/xekemunoxivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36f934a-3126-4118-b6be-1bcce270d69c/25649135515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c308d72-a849-4070-b485-a305016fcc49/ambico_tripod_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90cc817a-f604-4611-a833-ec5b205cf861/where_to_install_skse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/849e1d08-99c1-4f92-b4f8-04c3b7eba3d4/52535678322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/838b2e59-65f7-4165-aedc-b109ae52f7d3/hidden_valley_ranch_dressing_recipe.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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 4828 bytes
SHA-256: 3389fa350ed9cf86cb4514e6c039ea6b74e2fcca54190af2041754a05085de5e
font_01_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 11468 bytes
SHA-256: cfb88ce27505620f1d150524eefd65a6c8d8a5f75b81b86d5e06b6bddfa1eb42

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