Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1207187ad5705e…

MALICIOUS

PDF

70.6 KB Created: 2020-11-11 23:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2d8c8adc3a6cc5e62ba48f7876cf36ca SHA-1: d267e45a68de00dc1a5378e9b8f3a39c3addc8be SHA-256: 5b1207187ad5705edfaa3e36c272bfbec0199ed8ff467160b38bc87dfc575a3f
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://trafficel.ru/123?utm_term=amd+high+definition+audio+device+driver+download+windows+10 PDF link annotation
    • https://zusamazoboxo.weebly.com/uploads/1/3/4/5/134527389/8955489.pdfIn PDF document text
    • https://kizozejibudi.weebly.com/uploads/1/3/4/4/134460324/subepuro.pdfIn PDF document text
    • https://dogiwubof.weebly.com/uploads/1/3/4/4/134400908/9f215be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5f8dfc63c8de5.pdfIn PDF document text
    • https://kumuxabe.weebly.com/uploads/1/3/4/6/134670594/5737575b3.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/ramupira.pdfIn PDF document text
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/6038258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_5f9c465331c09.pdfIn PDF document text
    • https://rinavufapakoto.weebly.com/uploads/1/3/4/4/134460237/5195996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_5f9c9b0bc577e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_5fa22a0bcbe9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_5f8f6ddb3accf.pdfIn PDF document text
    • https://zoparojo.weebly.com/uploads/1/3/4/7/134762662/e7cbc01f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392444/normal_5fa8c4fbba0fc.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/82369f06-bf96-4cec-acb1-b158680b1f23/dometic_thermostat_troubleshooting.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_off0000d64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 5772 bytes
SHA-256: 5c907b5364e2545fa97e9a67714bc97cd21e61cd9dedbe61ac052d964062780d
font_01_sfnt_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 10268 bytes
SHA-256: 6ae174df876a7fc85c30d1246dbd4e2075d7aaf1aadfbb6183da9c0f09c5d06c

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