Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b7975d12c4cb98…

MALICIOUS

PDF

87.6 KB Created: 2021-03-22 02:58:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 688c3edaa00e83120599449b88ab7928 SHA-1: ecaba97d78ff18b0cfafd4faa4b2b64aa2cf5480 SHA-256: 26b7975d12c4cb98513bc065b38abc2120bce768a274c61e11e52e109176727d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=watch+sherlock+holmes+2+online+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484993/normal_5fd82cd842358.pdfIn PDF document text
    • https://xidoferowugefu.weebly.com/uploads/1/3/4/3/134348033/wusinazinaz.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/Fzja8he/memozisulunirisobo.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/GWgdBMV/38274774947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_602377408e412.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/I5iashi/primal_legends_hack_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479916/normal_5fc5a3d7abbf4.pdfIn PDF document text
    • https://cdn.sqhk.co/dekorasenu/fienicY/facebook_app_iphone.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/surudaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_5fe8530e836c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384050/normal_5ff00a4b74624.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/d4464d02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_cb3c5bd6213c4e4990a920280d9912d5.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_1e8c1fc6f6b54ec3bb06347dd2b64847.pdf?index=trueIn PDF document text
    • http://vukelas.rf.gd/51408794701.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_96caef97ff3d4bed8608bc8f8dcc6191.pdf?index=trueIn PDF document text
    • http://wutagokavejeve.rf.gd/12124151859.pdfIn PDF document text
    • http://desojamoj.rf.gd/perforated_aluminium_sheet_malaysia.pdfIn PDF document text
    • http://zafediluxewo.rf.gd/23749942274.pdfIn PDF document text
    • http://sedegavokoxuk.epizy.com/74348325469.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_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 5332 bytes
SHA-256: 868775d9bfd6e25bed8451d9d4b0368f3dd083a4cef3fb630493bdb2d9cfba3d
font_01_sfnt_off00012ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC9 11380 bytes
SHA-256: 7ce339bb3b693288abdea2232203bc5adcadf170cb5b851521e9d846f5366c02

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