Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f34d3c44162f2b…

MALICIOUS

PDF

76.4 KB Created: 2021-02-23 04:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e1176793b334d93b6a1940eab619789 SHA-1: 8bc9053b5b47c4e3acb7c1f14dbd2c17b827f628 SHA-256: 23f34d3c44162f2b7fa4c95b7f1329fcdabf6ea7d41ab828883af1b1a4f3d9c5
206 Risk Score

Malware Insights

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

The PDF document contains a lure related to Cuisinart product instructions, but its primary function is to act as a link farm, directing users to numerous external PDF files hosted on disposable domains. This behavior is indicative of a phishing or redirection campaign, likely designed to lead users to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/aws?utm_term=cuisinart+supreme+grind+automatic+burr+mill+instructions PDF link annotation
    • http://mon-cmbretagne.com/zisoramekizobugadusiyp8uo.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/hjgcgg9/60757285499.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/jjsifUG/sewudokabom.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/qkJjef7/steamboat_springs_to_denver_shuttle.pdfIn PDF document text
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/3930577.pdfIn PDF document text
    • https://devatokur.weebly.com/uploads/1/3/2/6/132683056/f5b443b.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/SqPMibq/dujok.pdfIn PDF document text
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/384f03af21.pdfIn PDF document text
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/mivobazanufodid.pdfIn PDF document text
    • https://soregekewo.weebly.com/uploads/1/3/4/2/134266411/9739825.pdfIn PDF document text
    • https://cdn.sqhk.co/xumelesep/gX0IkKZ/semopegaziwimi.pdfIn PDF document text
    • https://vipefujalebir.weebly.com/uploads/1/3/4/7/134744486/gidopulawutiw-mukedofo.pdfIn PDF document text
    • https://cdn.sqhk.co/pometobab/gPWsOia/gartner_bi_magic_quadrant_2020.pdfIn PDF document text
    • https://xukonixivuki.weebly.com/uploads/1/3/0/9/130969652/2110274.pdfIn PDF document text
    • http://amandeepsadyora.com/rimworld_infinite_chemreactori105w.pdfIn PDF document text
    • http://allostar.buzz/sims_4_update_3_september_2020jr4q2.pdfIn PDF document text
    • https://kitenogoxaginup.weebly.com/uploads/1/3/5/2/135298643/7961388.pdfIn PDF document text
    • https://cdn.sqhk.co/guzorata/xtiaigw/the_zombies_time_of_the_season_rap_remix.pdfIn PDF document text
    • https://famopedudir.weebly.com/uploads/1/3/5/9/135978287/modobekijubugu.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/iifMghs/90s_hits_youtube_playlist.pdfIn PDF document text
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/guxazamibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 5436 bytes
SHA-256: 06d94bda90d65ca41887a0c0bb5f5f450ba26519af2699ffdc812bf7fbacd057
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 11084 bytes
SHA-256: 30aae1135e4bf7eba71313899908a1b56f51132dfa7425c9be82b64a3e9c6264

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