Malicious PDF — malware analysis report

Static analysis result for SHA-256 12534076459f464d…

MALICIOUS

PDF

84.3 KB Created: 2021-03-05 21:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 29440c0960d6c348352678c67d5a0553 SHA-1: 962c00ff4a56b82c63589482aafb309b57b70b5c SHA-256: 12534076459f464dd68486a397c65351368dc5c96102f737d699c8fe0a131bba
156 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 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=kolb+learning+style+inventory+questionnaire+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408001/normal_5fc869b21a2a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_60185471aae85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486197/normal_6003398063c0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449622/normal_600298d154e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_6012190d9240e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366995/normal_5ff14ab25fbd7.pdfIn PDF document text
    • https://cdn.sqhk.co/woxutonezem/hhfU492/15617518079.pdfIn PDF document text
    • https://cdn.sqhk.co/kefivaxepaj/f2YYG2H/stick_fight_archer_mod_apk_hack_download.pdfIn PDF document text
    • http://robolab.one/fibadurofovakid4bkg.pdfIn PDF document text
    • https://cdn.sqhk.co/tevimuwijile/Nkjjnic/89293270754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_603fca103e37f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421042/normal_602e44da020e3.pdfIn PDF document text
    • http://organicsss.space/fewolisugojeyju9l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469119/normal_5fcc9e3ecada6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_98c3d5f5a0a449148a98bb158d7c000a.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_03993abcbc6f4098ab1133e0caa123e6.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_3cffe69a82af496b9e4207513bcce2ba.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_799cdec5dc5f4bc7933ffda9050c514c.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_0c2e9f84198e45e795c50ef5d5b4040c.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_80275b62f97e49179dc42eb92590682d.pdf?index=trueIn 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_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 5608 bytes
SHA-256: 1d0d1f47820c2297b3c2e99c7c2fe3964fa2e86a1f9d5e98d15637a8d9abe05a
font_01_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 10960 bytes
SHA-256: f7271b142cd001a065fdfcc0aa5825d4aac9d245d8f15d03b0e9346d290c9983

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