Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea096709715632a…

MALICIOUS

PDF

78.8 KB Created: 2021-01-06 11:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6b4f039f2a92acc01bad31899c4650de SHA-1: d7e8f0306f224d8482160f9771dae479d5e72cc6 SHA-256: 1ea096709715632a2ea562da14271affe8dd38c91b7ff82cf6b7d990b4c34d29
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect users to 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://trafffi.ru/123?utm_term=chutes+and+ladders+park+bloomington+mn+directions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474722/normal_5fad7f29f2fe4.pdfIn PDF document text
    • https://tiwidugeges.weebly.com/uploads/1/3/4/6/134635585/9208634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_5f992a8894d80.pdfIn PDF document text
    • https://vafumesaz.weebly.com/uploads/1/3/4/5/134589630/4a1ce58cbeee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410462/normal_5fe3da9c2d0d3.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/cXjhjdb/drumsy_emi_face_reveal.pdfIn PDF document text
    • https://tixatodaja.weebly.com/uploads/1/3/4/5/134507568/tonenebapasij.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/sezewu/ripowek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d55ba9-dbd9-4553-98fa-4ea6b05c16a8/tolivonubisugatuzodaged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c2c1ef-8de2-482a-a911-4c2e7083f05e/1269886540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1499a9dd-271d-440e-87e1-4dd92e10748c/zijuporutoku.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/digestion_vocabulary_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd699fe7-643a-4c4c-afc7-6b64fad6b285/rosie_john_mayer_lyrics.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 5596 bytes
SHA-256: c8fce51cb4b01ca33eb7aa61469260b3256f3601b2d482a9ff93ce149512cdc2
font_01_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 11208 bytes
SHA-256: af399bdedd5839a4bb36cc6c9b5599bc19877ddd1b2dc25e72592d2bce73c91c
font_02_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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