Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc4a29823114814…

MALICIOUS

PDF

78.6 KB Created: 2021-03-25 14:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1262f75938b5a2746a748bc733f4663c SHA-1: 60c804a57d2a2ef3431d92169c6981d354c33f52 SHA-256: acc4a298231148149a18e716eb777c95afa3c9f7d53b3e5e4ffe88ef4e11d0b0
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=jumper+box+for+car+home+depot
    • http://shtampshop.ru/52351107830sp9lj.pdf
    • http://xidemapewa.22web.org/selosefasapenakodibivuda.pdf
    • http://mainsale.pro/is_betty_crocker_gluten_free_brownie_mix_dairy_freeup12g.pdf
    • http://good-production11.site/socratic_seminar_worksheet_middle_schoolibr2g.pdf
    • http://arendaavto.taxi/tusafukafop0l1ud.pdf
    • http://drovazvenigorod.ru/non_chronological_report_writing_checklist_ks2d5sxd.pdf
    • http://formblckr1.xyz/hungry_shark_game_download_hackjsmsh.pdf
    • http://znakomstva18x.site/kalokuleigghq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/719d9740-17c0-446b-aadc-3dea3e0d965b/making_venn_diagram_in_powerpoint.pdf
    • https://s3.amazonaws.com/fidobakipivogit/gojesibineta.pdf
    • https://s3.amazonaws.com/xixonu/noun_modifiers_exercises_with_answers.pdf
    • https://s3.amazonaws.com/remeranexe/karl_marx_religion_theory.pdf
    • http://riwexakax.epizy.com/47348248164.pdf
    • https://uploads.strikinglycdn.com/files/aca19514-d37f-4499-a753-e7810829d1f7/bodas_de_sangre_personajes_el_novio.pdf
    • https://uploads.strikinglycdn.com/files/3fb2e57f-5fe6-441c-9ee6-8e443c0b17a8/12796691856.pdf
    • http://sizemedapaparum.epizy.com/bhilsa_topes.pdf
    • https://s3.amazonaws.com/julaxel/48214522352.pdf
    • http://tiwemevi.rf.gd/fulosigasudapaluxiru.pdf
    • https://uploads.strikinglycdn.com/files/e8b896a7-452f-4510-844a-03d7f528197d/20148401618.pdf
    • https://uploads.strikinglycdn.com/files/e85bf56d-9bfd-4550-83b1-eb782495b831/37739773110.pdf
    • https://uploads.strikinglycdn.com/files/5d61cba5-e1ae-4db1-8f78-db757f0940cf/what_is_a_contract_law_definition.pdf
    • https://s3.amazonaws.com/vunizi/which_michelin_wiper_blades_do_i_need.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38d.bin
15f80ef2b3820dcf6774e8c133519958008433edbf83c2797cbd1767069b4ee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 5384 bytes
font_01_sfnt_off000105aa.bin
c653aa195c08ff487c92b16d93d9b4092fc7c556a4c8bbdd14082a94be9dc65a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 11668 bytes

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