Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5fd7a0ddc56518…

MALICIOUS

PDF

74.0 KB Created: 2021-02-15 22:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7f15744644dc4c055252577817c0e7ec SHA-1: ca7c834fd068feb01b81cb598e4cf943b73e077b SHA-256: bf5fd7a0ddc565181679c92800c4923b1f113baa8d7fb0df0263a233db86a868
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external PDFs hosted on disposable domains, suggesting a link farm designed to obscure the true malicious destination. The presence of a URL related to 'fujitsu fi-6130 mac driver' indicates a lure to trick users into downloading the malicious content.

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 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://jacksth.ru/strik?utm_term=fujitsu+fi-6130+mac+driver PDF link annotation
    • http://vvinorama.fun/rossmann_prospekt_bltterkatalog08zlz.pdfIn PDF document text
    • http://bettermoneytips.com/bajupinewiloroberarobo89re7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_601115c07556d.pdfIn PDF document text
    • http://giocodigital.website/lexis_audio_editor_premium_apk74wks.pdfIn PDF document text
    • http://nofuwev.iblogger.org/67499793293.pdfIn PDF document text
    • http://antonioit.space/82061147130ul7pm.pdfIn PDF document text
    • http://healthyforczechrepublic.site/743339243717nrs5.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/gjjcjdb/wyrmwood_dice_tower_kickstarter.pdfIn PDF document text
    • http://good-production16.site/piano_man_lyrics_brandy_norwoodptg2b.pdfIn PDF document text
    • http://7lessons.fun/96422623778jgka1.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/juwofuxufijup/30945266025.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_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 5772 bytes
SHA-256: efd6b1ef43662bacc3cea8b5012bfbe156e5ec31229c2e9ab99c3d5a09fca6c7
font_01_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 11572 bytes
SHA-256: df351fc769b82b1cb626db81cc9866377323ac7a5c7baaa3c9379e0785e220dc

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