Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcef1ad8603ac448…

MALICIOUS

PDF

115.7 KB Created: 2021-06-02 07:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 610fa268440dba81c5102e58931a9e00 SHA-1: 948d73bc7d12372d808bb9f79ec367697e295942 SHA-256: fcef1ad8603ac4480a44f9d2da25e63254c322d8e5eee76eb7d62be9bfed796e
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document exhibits social engineering tactics, including a visual download button lure and instructions to press Win+R or paste a command, consistent with ClickFix attacks. The document also contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/123?utm_term=vim+cheat+sheet+printable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389824/normal_6032f57432b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_6025a21c6ed89.pdfIn PDF document text
    • https://zunezazawegor.weebly.com/uploads/1/3/4/6/134665047/bivutinero-nolifa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_6008e09e7a2df.pdfIn PDF document text
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/folakebizolebu-kebebesijowex-samulod.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/4732275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459182/normal_6064fd9cae505.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/a14a47813d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474998/normal_5fee7d7d99ea6.pdfIn PDF document text
    • https://rutujuxifir.weebly.com/uploads/1/3/4/6/134632780/pezonidutok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_6020c1d0cf094.pdfIn PDF document text
    • https://rixekozezoba.weebly.com/uploads/1/3/4/6/134609597/3389980.pdfIn PDF document text
    • https://zebewanuvaxa.weebly.com/uploads/1/3/4/6/134613040/bc40af88.pdfIn PDF document text
    • https://zefilezagomi.weebly.com/uploads/1/3/4/4/134474677/jibabomikado.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/4cf4cca2-b284-40f3-bbf1-9d57270c4e67/tuduvitebunupipurutiluvop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d360ed6-307b-47c3-8e6c-8116867e5fb5/how_to_pair_my_lg_soundbar_with_subwoofer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56b6382-c57f-46be-a956-61dacb619b91/31878905510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8188fd-eb79-4218-ba67-f51a7446b71e/44808711239.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_off00018907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18907 5276 bytes
SHA-256: 57c1865276b395682048f1ee1de017c8827c210146b5bb57dc8be6c3c0a9908c
font_01_sfnt_off00019acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ACB 11380 bytes
SHA-256: 56ea668d1416f66ddea469fa66f5fd1948c798322931f5dfb86737067451412e