Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4c22b98999f9f3…

MALICIOUS

PDF

75.0 KB Created: 2021-02-15 08:26:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a2600aca6ca00242e1bd39e52044ebd3 SHA-1: 50e1b2dae3f505224450aa225d5c1b37c0fd85fe SHA-256: 9f4c22b98999f9f35c3a526f8a1bdd086c90557d23dbd2cdaf51779bd0f74823
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://jacksth.ru/wix?keyword=doppelganger+pathfinder+alignment PDF link annotation
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/gawupelejifogetar.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/gfugjQa/unmatched_air_traffic_control_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tikisudolo/tghaEha/turbo_cooker_price_philippines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493579/normal_6003cdca53682.pdfIn PDF document text
    • https://wuzovogupo.weebly.com/uploads/1/3/4/7/134720757/nokiteza.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/sidipapajadinenux.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/gheX5P0/72003489557.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/jgNhhc6/atom_tickets_movie_showtimes_tickets_santikos.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/c4Iiijc/sigute.pdfIn PDF document text
    • https://mitamegupep.weebly.com/uploads/1/3/2/3/132302953/ganob.pdfIn PDF document text
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/jotonejiton.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/icHv8np/29481377599.pdfIn PDF document text
    • https://cdn.sqhk.co/jonuwezipagi/Sge0ie8/chex_quest_3_brutal_doom.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/gigfjbY/56802018295.pdfIn PDF document text
    • https://gitakitopawal.weebly.com/uploads/1/3/5/3/135325500/gilele.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_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 5276 bytes
SHA-256: af1ceda5ddfd842d3a5251e2c3d68e53c0e5f453384455de0695d57b2a560cf1
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 10600 bytes
SHA-256: 3a4cd1acfa7436be0b9b16502bac2b30e482b37b707d14c2dc26f360baf72f4b

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