Malicious PDF — malware analysis report

Static analysis result for SHA-256 54aa529534f9bf98…

MALICIOUS

PDF

83.1 KB Created: 2021-05-28 00:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b71617b84ab8036c8193b1ac97a1272a SHA-1: 72a4adcc5d70889dbf92eac9afdd081708ac10d3 SHA-256: 54aa529534f9bf9858c0bd227e61043ba7950ed9c2082d25d5c53b341449e96b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to a large number of other PDFs. One of the primary external URIs points to a URL that includes 'used car bill of sale template florida', suggesting a lure. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/123?utm_term=used+car+bill+of+sale+template+florida
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/1170610.pdf
    • https://cdn-cms.f-static.net/uploads/4385207/normal_60472a37cfb34.pdf
    • https://cdn-cms.f-static.net/uploads/4409413/normal_605654bd714aa.pdf
    • https://nenopejir.weebly.com/uploads/1/3/4/6/134603535/tefejefa.pdf
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5ff264575980a.pdf
    • https://potigaguw.weebly.com/uploads/1/3/0/9/130969810/5923396.pdf
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5ffbbdc2ec37f.pdf
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/e3655091abca2c7.pdf
    • https://cdn-cms.f-static.net/uploads/4385880/normal_605d8d819cbbf.pdf
    • https://mabexerezigija.weebly.com/uploads/1/3/5/3/135324341/lasudotadesilexal.pdf
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/pafevizononuza-tevidenexa.pdf
    • https://kefenageteda.weebly.com/uploads/1/3/0/7/130775977/rekokorubovudox.pdf
    • https://nasaperexi.weebly.com/uploads/1/3/5/3/135351481/a2811355edcff6a.pdf
    • https://jasesinokez.weebly.com/uploads/1/3/1/1/131164090/zibafu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/709b4fb7-862e-4af0-8df1-5336268014f5/los_vatos_locos_pelicula_completa_en_espaol_latino.pdf
    • https://uploads.strikinglycdn.com/files/6695844b-5a1b-4135-9c62-564fad20d2c4/when_to_use_radical_acceptance.pdf
    • https://uploads.strikinglycdn.com/files/a51426d1-5a4d-40be-9536-0e7fab9d93a3/libro_de_espaol_3_de_secundaria_2020_trillas_humberto_cueva.pdf
    • https://uploads.strikinglycdn.com/files/1a455df1-6825-427f-8c1a-e7fea281fa07/catalogo_virtual_tennis_importados_price_shoes_2019.pdf
    • https://uploads.strikinglycdn.com/files/0f219974-ab38-4d89-ac0f-c2d5fb435aff/parrot_ck3100_problems.pdf
    • https://uploads.strikinglycdn.com/files/4d825a73-ae25-4e8c-8893-e7489c749ccf/cmr_national_public_school_hennur.pdf
    • https://uploads.strikinglycdn.com/files/74cd7837-0396-4d07-aa8d-20400ae13290/vojomadagiluda.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_off00010598.bin
c15ad5233a2b5e6e639fd0bb39eac752144f3bc1c3642d2cc4dc5e1907779f0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 5432 bytes
font_01_sfnt_off000117fa.bin
eda20aab7bc57de36d6bf753e701c90e6da88eec78e56dfe34ed1d260a7ed241
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 10964 bytes