Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9220d33d749696…

MALICIOUS

PDF

78.3 KB Created: 2021-02-19 16:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5e053cb38b5b8700cdedad78d3fa2404 SHA-1: 206c2142bd10251e6ed8ff4beb92f959e7df0d2f SHA-256: 4d9220d33d7496963341602dc1dadc3c5d79a2e2af02dfbab04224a6ccbe3bb2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs suggest a phishing or content distribution scheme, likely intended to lure users to malicious sites or download further malware. No scripts were extracted from this sample.

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://druttle.ru/wb?keyword=does%20my%20thermostat%20have%20a%20c%20wire PDF link annotation
    • https://cdn.sqhk.co/redusebi/hggUwgi/two_player_pokemon_battle_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/jfHhagg/91944177211.pdfIn PDF document text
    • https://modezajuv.weebly.com/uploads/1/3/4/0/134097040/fegawutolevuge_pawunifizedofo_nexagud.pdfIn PDF document text
    • https://cdn.sqhk.co/putepirapad/gNnH3Qa/dukope.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/it1he9X/rays_barber_shop_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/zToiahd/zebra_crossing_abbey_road.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/Hjh1Sjj/bupet.pdfIn PDF document text
    • https://tezubowaxax.weebly.com/uploads/1/3/4/6/134640868/2141198.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/fIrgdib/fasufezudezi.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/dBzbiqh/82884163407.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486765/normal_5fff57072b202.pdfIn PDF document text
    • http://kinoxca.xyz/navy_boatswain_s_mate_manualvh13q.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/online_to_autocad_dwg_converter0uauk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_60141458dbc61.pdfIn PDF document text
    • https://fojomifurinu.weebly.com/uploads/1/3/1/3/131378835/77e0bd7190f3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460476/normal_5fef7b0b5f2b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_6027d2dd77fb6.pdfIn PDF document text
    • https://kipokemob.weebly.com/uploads/1/3/0/7/130738996/7e7c7880cdbc053.pdfIn PDF document text
    • http://masterpowerpoint.com/how_to_tie_string_into_a_looph7leo.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/iaL7Kig/15200241343.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/baxekojojexusol/sigisamowemep.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_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 5260 bytes
SHA-256: b92fa084998efe3a57cfeee1985523d7a0c56f37b7d98a0c005e0e96a016adea
font_01_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 10808 bytes
SHA-256: 6763620fbb961dafb78c46f4c30b530452c621caba4afe5b4404d0e7f41f8907

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