Malicious PDF — malware analysis report

Static analysis result for SHA-256 f942ad2e0b294d9a…

MALICIOUS

PDF

71.8 KB Created: 2021-04-01 19:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: de8c155a1af8d52c1f2fca1a8844be90 SHA-1: b020d5439c5b44471c6629139c2c9df73c4ecfcf SHA-256: f942ad2e0b294d9a202d7b6966e441c4ce2c0960fa59cfaf7c2c4d5ae08b083e
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-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://leonvi.ru/strik?utm_term=womens+jumpsuit+pattern+pdf PDF link annotation
    • http://whysmall.space/88333195308cqi68.pdfIn PDF document text
    • http://nugotokilovol.iblogger.org/oh_hell_card_game_rules.pdfIn PDF document text
    • https://tolubezilonis.weebly.com/uploads/1/3/5/3/135348590/4830400.pdfIn PDF document text
    • http://fovijivil.iblogger.org/what_is_the_salary_of_computer_networking_jobs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451929/normal_600560d9e691a.pdfIn PDF document text
    • http://bemelegevew.22web.org/fijinufesusanitam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_602d9fce56952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_60544e236c8a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_6018a669ca80b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_6017024ed5dac.pdfIn PDF document text
    • http://fishland.store/kali_linux_live_usb_freeuuljn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_605b970b6ac7a.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/xikorowezodazutor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460708/normal_6011235721a15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425738/normal_5fcd25810adab.pdfIn PDF document text
    • http://jagefefixod.22web.org/all_information_about_pakistan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xexisupakixamod.rf.gd/laboratory_apparatus_pictures.pdfIn PDF document text
    • http://xilituvid.rf.gd/purpose_driven_life_journal_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_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 5244 bytes
SHA-256: 88bd7ea58c56538ae8e6b99a30dcdaac7ebe7601087534529e45168939a88bdf
font_01_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 10668 bytes
SHA-256: 4996825f8384033183fedc26aaa82d16639e38c670d07ee6b5782990ba30ac9a

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