Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b84d0224a77f41…

MALICIOUS

PDF

74.7 KB Created: 2021-03-30 08:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ccf4d57f050ccfa699dcd9502c963a31 SHA-1: 561f23d4b9bf4bf28b44253c302acb9dce25d2da SHA-256: d6b84d0224a77f4199f8679ff3274d406c2a2e5305d1f5f61f2db477778b6772
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://nipisod.ru/123?utm_term=twin+bed+sheet+size+in+meters PDF link annotation
    • https://likixadukevagal.weebly.com/uploads/1/3/4/7/134700169/5904902.pdfIn PDF document text
    • https://nubukagogurug.weebly.com/uploads/1/3/4/4/134495847/wunawewugowu_pewefonija_kixosokarixuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468571/normal_60521ee63d87c.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/13171165179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457857/normal_5fcc94ab17abc.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/37735128164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415322/normal_5ff5ea2223bb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454171/normal_60470f2951db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404738/normal_605a20802f784.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/vuforewebub/likadawuvewusixaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d08fe92-7a7d-4db3-9422-e06d1843f17b/brinkmann_smoker_electric_element.pdfIn PDF document text
    • http://sugazaxarul.epizy.com/simobesi.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/battle_angel_alita_anime_dub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129c92d8-4cb6-4b9d-8199-e91c4a9c65c8/principles_of_electronic_communication_notes.pdfIn PDF document text
    • http://kelopemajidimux.epizy.com/toshiba_smart_tv_50l3400u_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01afe74a-2c8e-47e7-b260-c763f7d0902f/40052357117.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/cession_de_vente_voiture.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/xetesemaba.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_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 5056 bytes
SHA-256: 2fb728e30abd8b776d64fc4d5c35544fc69159f04d2ce3328c374b4684e049fd
font_01_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 11196 bytes
SHA-256: c889257205bee9a95c2b094932c4ddede87680ee0d54da0be67336974c036d1a

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