Malicious PDF — malware analysis report

Static analysis result for SHA-256 6580b8adb36b58a2…

MALICIOUS

PDF

77.8 KB Created: 2021-01-26 08:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 16037c669f09b7d63b51ab3313e6b7f3 SHA-1: 944692c4844fcfa544a2691847bf6c088c6ca7c0 SHA-256: 6580b8adb36b58a2946e7a9ff285354934e01f533bb4b9716df491f957bf64c1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/123?utm_term=nurse+t+shirts+near+me PDF link annotation
    • http://igafnd.org/pokemon_tcg_online_cheat_codes_2020a79c1.pdfIn PDF document text
    • http://verifybadgesbusiness.com/legends_of_runeterra_cards_wikiuayjr.pdfIn PDF document text
    • https://nidatufibamukun.weebly.com/uploads/1/3/4/1/134131265/079907ad.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/aIXia0n/8307841060.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/woforil.pdfIn PDF document text
    • https://wokozizexufam.weebly.com/uploads/1/3/4/2/134234926/nosaxunavova.pdfIn PDF document text
    • https://kijujiwovijuk.weebly.com/uploads/1/3/1/4/131453096/6304306.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/funny_halloween_movies_coming_out_in_2020thrng.pdfIn PDF document text
    • http://giocodigital.space/89554162695e462a.pdfIn PDF document text
    • https://cdn.sqhk.co/porodiwaten/jbjb1je/dapujasewinaxiz.pdfIn PDF document text
    • https://cdn.sqhk.co/bizufunido/yidiejj/brain_games_for_dogs_diy.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/6a2a6fc1fe09.pdfIn PDF document text
    • https://libufuvebugun.weebly.com/uploads/1/3/1/4/131406816/naguxezozi_jifuzikuzera.pdfIn PDF document text
    • https://jowadukezivi.weebly.com/uploads/1/3/1/3/131379295/julojeke-jegonibafu-bakisivasus.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/LiiNhhI/tower_defense_infinite_war_tephas_fork.pdfIn PDF document text
    • https://cdn.sqhk.co/siwemawatu/rgjhVNy/knife_flip_game_song.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/SZKMjjf/business_insider_italia_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/dgccYVC/55298359636.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luropiw/up_btech_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/xonej.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/vesazazapipuzuponenodoviv.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_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 4860 bytes
SHA-256: 04c7988d61def0c67284d260c375aa2aa217da8add3a38b2f842d5ac9317dc93
font_01_sfnt_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 10808 bytes
SHA-256: 123b87fa79d36568f6365611488b43d9b4e176ed859b415ba19255508654a5fd

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