Malicious PDF — malware analysis report

Static analysis result for SHA-256 250ca2f93781f94b…

MALICIOUS

PDF

83.0 KB Created: 2021-04-20 12:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e5e4a2d3bdd5e0ee79f27b45beb3b4c3 SHA-1: d46395aa9be460e242b1eed250f2f87a107cc2a7 SHA-256: 250ca2f93781f94b12e05ab78065f0ffdd7980b797ad40cabeaf313c987cea43
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, indicating it's part of a link farm designed to redirect users to potentially malicious sites. The document's structure and embedded URLs suggest an attempt to disguise malicious activity as legitimate content, likely for phishing or malware distribution. No scripts were extracted, but the PDF's nature points towards initial access via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=how+to+study+for+your+written+drivers+test PDF link annotation
    • http://jiludedo.iblogger.org/modern_professional_powerpoint_templates_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/ifKPnhc/kuwaweroweg.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/xsLijBJ/flatbush_zombies_tiny_desk_concert.pdfIn PDF document text
    • https://cdn.sqhk.co/lewatesudo/9hcggiK/ark_survival_evolved_crystal_isles_artifacts.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/twhdSnV/daxezib.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/hzhgyij/59897336096.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/19148a51-55cb-4dde-9958-caed36ae8d71/fallout_4_mods_without_bethesda.net.pdfIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_8bcd5ccad894438c8bf36e6489c9a231.pdf?index=trueIn PDF document text
    • http://tasopawak.rf.gd/calculus_vol_2_tom_apostol.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_93cc8c0fd48746d7a5241560af96eb4c.pdf?index=trueIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_49420529ca3446f59d28ac72878d1f41.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66b0f54-a8bb-43b3-bc87-9c359f327f19/how_to_cook_jasmine_rice_in_power_cooker.pdfIn PDF document text
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_74cb89f5c14f41e5b016cc6bfc729e5e.pdf?index=trueIn PDF document text
    • http://pogapebod.rf.gd/mubewu.pdfIn PDF document text
    • http://pasazaxara.rf.gd/38446251521.pdfIn PDF document text
    • http://zukuwegafedes.epizy.com/98821713045.pdfIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_d57fe30c6a1f46ab91c87572e128586a.pdf?index=trueIn PDF document text
    • http://xuxerikafirin.epizy.com/98234088370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5ee6f6-e215-4e92-bc3d-06d0a79e0276/18157340026.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_8ff10dde931c4cd094ff4f9445038cbf.pdf?index=trueIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_22b4d92fc3414db59caa6b443e2cff39.pdf?index=trueIn PDF document text
    • http://kevusej.epizy.com/rumurimidozasig.pdfIn PDF document text
    • http://zuxamivim.epizy.com/gikekuriguxazovisokov.pdfIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_ef8f127b76644b25b463c2035cde0b2e.pdf?index=trueIn 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_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 4872 bytes
SHA-256: 29d99b733bb361b47c6ce37374d7a991ae3e2397b7e653b04458a7ed33bf9152
font_01_sfnt_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 10948 bytes
SHA-256: a529d719c2bdd3e2ef21a209b80fff8d26f83d0c409cdb20a0f86c1ee38be3f6

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