Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d8697db6327c8b…

MALICIOUS

PDF

96.7 KB Created: 2021-03-28 22:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8967d0ac75be918552b639afe20dcb3 SHA-1: dce4100a785f80e9e4eecbbbeba58eaa033efc80 SHA-256: f2d8697db6327c8b5b9273fd0328d4af1e1e8a97082cc7b88046b46194fd280e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, with the primary suspicious URL being 'https://pelibifir.ru/award?keyword=changeling+the+lost+pdf+trove'. The PDF structure suggests it's part of a link farm, likely intended to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=changeling+the+lost+pdf+trove
    • https://cdn-cms.f-static.net/uploads/4389793/normal_603825e4c428c.pdf
    • https://rerupogom.weebly.com/uploads/1/3/0/8/130874691/4454028.pdf
    • https://nobexuliga.weebly.com/uploads/1/3/1/4/131405940/kolava-pirebefuvizi.pdf
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/furife.pdf
    • http://verekozugotised.22web.org/effects_of_unemployment_on_the_economy.pdf
    • https://cdn.sqhk.co/notizejamebo/Lghoii1/wojowepetifij.pdf
    • https://cdn-cms.f-static.net/uploads/4447641/normal_6052f176ecf60.pdf
    • https://static.s123-cdn-static.com/uploads/4420244/normal_5fdfd8298f53f.pdf
    • https://cdn.sqhk.co/xugiwatokax/ichgIhs/texas_sheet_cake_recipe_using_sour_cream.pdf
    • https://cdn.sqhk.co/sudidoxa/bydWtbL/top_ten_werewolf_movies_on_netflix.pdf
    • https://cdn-cms.f-static.net/uploads/4384048/normal_60488f692f9c8.pdf
    • http://dokanusivodob.22web.org/aetna_rsa_dental_reimbursement_form.pdf
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/sosagi.pdf
    • https://tirawinuzupufe.weebly.com/uploads/1/3/4/4/134445233/8c609.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_161610e80903479f9d1a56a364e68c63.pdf?index=true
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_55f30e07839840c48c42279b650e4b7c.pdf?index=true
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_e96f23cb027b4a879251d7fbb67641fb.pdf?index=true
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_820350c2ee8c44a1b67a6b4783140e01.pdf?index=true
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_327a930eb3e141af9b5f8857262a118e.pdf?index=true
    • https://s3.amazonaws.com/mefadedosuw/mosufefokitajojojazanu.pdf
    • https://s3.amazonaws.com/salade/reset_google_chrome_settings_android.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130ea.bin
4a54f7e237bfc8f3d3ce6bfcf4c5e1b65321919ac485541ce3559c779dfbaf49
pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 5176 bytes
font_01_sfnt_off00014280.bin
b62aed1eece74ec2d9daaacaa3422abf077a38ffff7a73de7cd717c10c776ce3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14280 10816 bytes
font_02_sfnt_off00016744.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x16744 4324 bytes