Malicious PDF — malware analysis report

Static analysis result for SHA-256 5722235cea5fd007…

MALICIOUS

PDF

75.6 KB Created: 2021-02-14 15:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: aa26bf9738f45ef0524e6c35f209e012 SHA-1: 17176fa884b8a1c11e4a5e040d71b22c2b426d00 SHA-256: 5722235cea5fd007931dc312bd3c8019d8f14a09e5b3937440152d7fe2fb8ad8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, indicating a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/aws?utm_term=employee+performance+evaluation+form PDF link annotation
    • https://cdn.sqhk.co/nufomewo/gchcxje/disneyland_park_california_open.pdfIn PDF document text
    • http://vadonodip.22web.org/complex_fractions_worksheet.pdfIn PDF document text
    • http://buytoday.cc/count_on_me_ukulele_chord_guideg8dw9.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/jotisama.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/hiRVhh4/mikozadikakivedifo.pdfIn PDF document text
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/6070120.pdfIn PDF document text
    • https://wuzitefagoxu.weebly.com/uploads/1/3/1/8/131856046/pifubafejaxe.pdfIn PDF document text
    • http://ledimpress.biz/37104374122m0zto.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/CjL0njh/logo_game_guess_brand_quiz.pdfIn PDF document text
    • http://heleogose.online/82804351417zsyfy.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/1208542.pdfIn PDF document text
    • http://rat-red.space/avengers_game_apkm3c05.pdfIn PDF document text
    • http://dewiluvafaridi.22web.org/hungary_budapest_guide.pdfIn PDF document text
    • http://wildber.store/baby_video_song_with_lyricsmls6v.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/WibThaE/head_soccer_world_cup_2017_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/ghlnLxT/24465689198.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuvadofer.epizy.com/aliens_1986_movie_480p.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/tudis.pdfIn PDF document text
    • http://dereduvate.epizy.com/99936354334.pdfIn PDF document text
    • http://kenamumiv.rf.gd/color_code_personality_test_answers.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_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 5100 bytes
SHA-256: db4ab41b2749c3f8ff13afc14e7cd6a6d2217c6a0bbc6023a45f0a29d763a566
font_01_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 10780 bytes
SHA-256: 3b8a851091bae3f2e92a16832bafd1ef641cdfc0d3483f77a2bf3bb6ca5b664b

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