Malicious PDF — malware analysis report

Static analysis result for SHA-256 7942d43dc84adb78…

MALICIOUS

PDF

69.8 KB Created: 2020-12-22 22:51:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: db6f61a83e7106a5b11a8f89ba5ff39b SHA-1: bb0c8870e3b84fd0f70bf4fa296f9f98cb6cc323 SHA-256: 7942d43dc84adb7842c56f8618642cb93dafbb415616a9401684360697ef2e92
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=does+ultimate+epic+battle+simulator+work+on+mac PDF link annotation
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/1164068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_5fa973083207f.pdfIn PDF document text
    • https://bamaxasujobuz.weebly.com/uploads/1/3/4/3/134315865/gozuw.pdfIn PDF document text
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/5556366.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/xewuj.pdfIn PDF document text
    • https://vufuvato.weebly.com/uploads/1/3/4/7/134718288/1343588.pdfIn PDF document text
    • https://retorize.weebly.com/uploads/1/3/0/9/130969817/cb013286d710e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d1cca1d9-6850-4f93-af23-6398b0017db6/jay_z_blueprint_zip_sharebeast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3388cfc-490f-4b2f-8646-c3051e0dcb49/suzosegow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1bf487-f8cc-4f80-9964-2b3cce7cff8e/steamworld_dig_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0707ea3-2d0e-4925-a8e7-ffcf7eacad97/85073301485.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC587 5256 bytes
SHA-256: b7d7577469075a786bb5b1ef9128d8effe20ac15f509f6a0eb302173ecaf6127
font_01_sfnt_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 10828 bytes
SHA-256: 55170990f0707257a041b1ab289ca9fb4daa4727beb265deb4b909f539e71a6b
font_02_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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