Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8887f3ed1cb9e7…

MALICIOUS

PDF

76.7 KB Created: 2020-12-23 01:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 48c067853f85e674f05fd7d40e99bd39 SHA-1: d230a3a5bbcc1e7a59f749691099ccae0afe3fc4 SHA-256: 5e8887f3ed1cb9e775d7b81e0f0b08ccfda8db2c536f6207fe9a5649d5452822
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm likely used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of numerous external URLs points towards a phishing or content distribution attack vector. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://traffset.ru/aws?utm_term=linear+inequalities+in+2+variables+worksheet PDF link annotation
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/79063f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5fce90650b432.pdfIn PDF document text
    • https://najunores.weebly.com/uploads/1/3/4/3/134381484/165193e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fa9bde861734.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/241794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5fb2f3136be30.pdfIn PDF document text
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/660967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_5faae84826c42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5fd8818b4dc6b.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/173d3ebf-1fe4-4757-a9c2-9576456b9c52/67207347242.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ba3b0a2757459be1f9cb/t/5fc2ba013f75b166432de6be/1606597121887/difodisebodax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b6ced5-4857-4405-8bd5-9dd02f9931ed/1994_ford_ranger_manual_transmission_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca075ff2-5d14-4266-996a-0e3cc3ad1ee5/photoshop_styles_download_free.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_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 5328 bytes
SHA-256: 20350c3a3e1c8562752b3573698191d4a9ab09dacd38d9e18895443699d50c22
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 13572 bytes
SHA-256: c37d6bebadba24b6d6d53e13b8b7667a96bffd1522f9d848f1c522dc47e60643

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