Malicious PDF — malware analysis report

Static analysis result for SHA-256 254841b91ada2827…

MALICIOUS

PDF

83.0 KB Created: 2021-04-08 21:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 84114398eacf3d93a57ca9d936f539e0 SHA-1: 9c3ec30ab4183a26ac19ce1de1e658cc8d2aea2f SHA-256: 254841b91ada28270199651370dc035052e2402c7fb3a00eaa73e64b40454cfe
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=forklift+training+course+outline PDF link annotation
    • https://zojufagilazit.weebly.com/uploads/1/3/0/9/130969654/5388887.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/5hZXVuv/dragon_pet_wow_classic.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/yamaha_kodiak_400_oil_filter_wixyanx8.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/ghfanie/toronto_street_parking_zones.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/tetakezorerasi-nevipe-timesuta.pdfIn PDF document text
    • http://repochka.site/tecnicas_de_redaccion_parrafo_ejemplo42er4.pdfIn PDF document text
    • https://cdn.sqhk.co/guzelatolina/nAjjgdl/xijitabunilufis.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/cXM9iho/fumejiditurutusosojize.pdfIn PDF document text
    • http://prizinsta365.site/best_self_defense_knife_for_a_woman2ai5h.pdfIn PDF document text
    • http://easterthjg.com/22985382522f4u9m.pdfIn PDF document text
    • https://cdn.sqhk.co/talokelom/RJ3jagh/fuxinawefifav.pdfIn PDF document text
    • http://afracheat1.xyz/from_superman_to_man_ja_rogerstq3si.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e2f2b276-6010-4053-a30b-cadc21dc93f8/vagukamunudil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a92fcb-f9cf-4b6a-97ed-0fac8d326296/fatawuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37876852-4a92-45ef-92b8-e3521703c146/jajalifine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89f0cc5-f6f1-4791-a9fd-cac18d2b7794/misibanabuxufomisowinirim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8fa41b5-7ae4-4c94-a134-4bc7c27450dd/mechanical_engineering_internships_chicago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d902648-2b61-4a73-a34b-45ad5e10787c/rimidawenigezaxamola.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_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 4948 bytes
SHA-256: 23606b720c2c088536dacb1a5e11cb26872bd4c0591166765f6f96ffed1c831a
font_01_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 11116 bytes
SHA-256: 4b32351b6440c1e65ad5e730444a08502e2af2d60ac8e5b5fa4e9c79ab697043
font_02_sfnt_off00013065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13065 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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