Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5d3a8ac51e36a6…

MALICIOUS

PDF

109.4 KB Created: 2021-03-27 11:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9fb63fb21ff1ca79431d147fb0363fe SHA-1: e0f3ec323221d97c8b31519a99fda5622102793b SHA-256: 1f5d3a8ac51e36a6327ce0f60d0e1114dbedd9d1d0de4eac08cab8784bb45dcd
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies the document as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/award?keyword=georgicas+virgilio+gredos+pdf
    • http://fezelegafefuv.mywebcommunity.org/jitoneteb.pdf
    • http://oneitshop.info/throw_blanket_basket_ideaszbudh.pdf
    • http://idealslimitalia-official.site/beliredavawudodepodorigesi2whh.pdf
    • https://cdn-cms.f-static.net/uploads/4465131/normal_60225f20154b1.pdf
    • http://thestablestl.com/zonoxofulagomgxzk5.pdf
    • http://kulotufiw.mypressonline.com/81121618093.pdf
    • http://beritox.medianewsonline.com/jitigibajixoteminewur.pdf
    • http://trells.space/hable_con_ella_torrent2fcq1.pdf
    • http://golixudib.mypressonline.com/white_tiger_marvel_netflix.pdf
    • http://larokamexi.sportsontheweb.net/boy_scouts_medical_form.pdf
    • http://zegererevez.medianewsonline.com/lujolazavijidepa.pdf
    • http://magic-world.site/ice_hockey_game_toronto_schedules57b9.pdf
    • http://natikolom.site/epson_v700_vs_v800_comparisonryu69.pdf
    • https://static.s123-cdn-static.com/uploads/4420476/normal_6003ae243d32e.pdf
    • http://vijexibat.mywebcommunity.org/tiwagoluseg.pdf
    • http://byseles.xyz/pygmy_hedgehog_care_sheetx3vae.pdf
    • http://teenagetutor.online/brain_training_exercises_for_anxietyf6hmg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_f7b6da4aa36546aca73e84ba51ebca6b.pdf?index=true
    • http://rogofideb.onlinewebshop.net/download_foxit_phantompdf_full_crack_for_mac.pdf
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_a580dd8ae7174e86a94ed26cf0d674c4.pdf?index=true
    • https://2df7536a-ab64-4dd3-a6ca-98e0eca144a4.filesusr.com/ugd/de578f_8aff7eeba4974bbf9fae40054fe027ba.pdf?index=true
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_958966f960db46e0b4f1dc422e79e353.pdf?index=true
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_68a6498945244fa5919ba140827f4909.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000166d7.bin
fe547a571b6fd74dcf97012bed17d7677eff37d41d8dc1ca345499e47362e7d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166D7 5416 bytes
font_01_sfnt_off00017961.bin
6444fb79550b3a307b0de345fc15edeee0b257351a05341ea33275fcff857370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17961 14460 bytes

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