Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb69b44fce2829a…

MALICIOUS

PDF

85.5 KB Created: 2021-01-18 11:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d3fcb2618829958cfbe9e8961afe177c SHA-1: 1040c9b25a998a031cf5403580d3f8c9cd2acd81 SHA-256: 3bb69b44fce2829ab94326c6b0507150155c2d6b818cffc07fec28dcccaf19dd
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, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=chilton+manual+vs+haynes PDF link annotation
    • https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/7055460.pdfIn PDF document text
    • https://xivimuwujaka.weebly.com/uploads/1/3/4/4/134440816/774384.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/2T83Pjh/feed_the_monkey_gizmo_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5f8aec8ba63ae.pdfIn PDF document text
    • https://rozapalevode.weebly.com/uploads/1/3/4/7/134705228/1837096.pdfIn PDF document text
    • https://wizujepubenepax.weebly.com/uploads/1/3/5/3/135317151/7f4ee6.pdfIn PDF document text
    • https://cdn.sqhk.co/manaruparil/ohifqIo/candy_crush_saga_online_games_play_free.pdfIn PDF document text
    • https://zonotilikoper.weebly.com/uploads/1/3/1/0/131071062/3558288.pdfIn PDF document text
    • https://damasidegiked.weebly.com/uploads/1/3/1/4/131411688/norezalijaw-tazifogogaxuzum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_5f99dc08c6f0b.pdfIn PDF document text
    • https://cdn.sqhk.co/nujobuja/hdiggdn/18356124854.pdfIn PDF document text
    • https://murepofolod.weebly.com/uploads/1/3/4/4/134480544/3734549.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/bTgcieu/icymi_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/17Shgif/bouncy_castle_for_adults_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/eKVdhhl/vox_cinemas_dubai_in_burjuman.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/bisute/navodaya_application_form_download.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/dj_aditya_name_ringtone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 4216 bytes
SHA-256: cc2e981207ff42047636e646e23044826538a19a6cf1ee0619715a3623b4c1dd
font_01_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 4896 bytes
SHA-256: 5ce38b650bc648aa901f189a57a195b41dba85e8155b12df9f3f011b318e84b4
font_02_sfnt_off000120e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E3 11200 bytes
SHA-256: af414ad4c87e3cdcfe57113d4fe7be7d4e68473af53844229e3393355ac6850a

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