Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a4267d09431df3…

MALICIOUS

PDF

78.7 KB Created: 2020-12-14 19:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ff687381f5674eb27182d87879e23942 SHA-1: c8e28049692bfbd60d7e13bf8288ddcdf1b53a7a SHA-256: a9a4267d09431df3324bb2aa3b80e2a228a55bcce5ced2291dab7a64a4c6776a
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing a link farm with 24 external links, many hosted on disposable domains. One critical heuristic indicates a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to malicious sites.

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
  • 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.
  • 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.
  • 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://gettraff.ru/123?utm_term=arby+nutrition+info In PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/5168799.pdfIn PDF document text
    • https://vekazapez.weebly.com/uploads/1/3/4/6/134601327/2718268.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/roxefobenabekipila.pdfIn PDF document text
    • https://vuzejugusu.weebly.com/uploads/1/3/4/4/134486163/nijitutefer_jugofanabivosis_gevolo_rivodiduta.pdfIn PDF document text
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/fuzenisixijimeg-buxopabagidifiz-rivomituzavit.pdfIn PDF document text
    • https://zibeselev.weebly.com/uploads/1/3/4/1/134131471/ledolubuvuzusa.pdfIn PDF document text
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/bc69e421772153b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453719/normal_5fced8833aa31.pdfIn PDF document text
    • https://binaxapanuse.weebly.com/uploads/1/3/4/8/134882688/wadenuxubedomalibap.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/d4743ff2-1120-4f9d-8877-537fa01dcf3b/94891221473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8852f6-9cb3-457d-b955-d598a33e9515/maldad_mecanica_y8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c196980-a2be-4f43-8708-525fd11efb5c/63896827307.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_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 4572 bytes
SHA-256: ce8b45b0490387a35c60a0a774382fc9bb944044adabdc9b5ae2bb3f5320ad39
font_01_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 10764 bytes
SHA-256: 5565b783fb620608eed3b3ac7b4bfdd526ac4763a098f7c261d7dd962f4b0a89

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