Malicious PDF — malware analysis report

Static analysis result for SHA-256 d234a1d393e36514…

MALICIOUS

PDF

73.9 KB Created: 2021-03-24 19:32:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6bdda238a232650b2c9b14488f07e32a SHA-1: e6d4cfae60cc2d5e7647942ce263108ab1d7cb65 SHA-256: d234a1d393e36514ed1b3a233d587cc53d606104f919f509748c33e1b62fa4bb
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'baarspo.ru/award', suggesting a lure for users interested in 'hallelujah shrek piano sheet music pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, reinforcing the phishing or malware distribution intent. Although no scripts were explicitly extracted, the presence of numerous external URIs and the ML classification strongly suggest malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=hallelujah+shrek+piano+sheet+music+pdf PDF link annotation
    • https://sasurejif.weebly.com/uploads/1/3/5/9/135966776/44c473f47b79cd.pdfIn PDF document text
    • http://dayzcommunity.info/what_are_the_steps_in_the_engineering_processj0bsm.pdfIn PDF document text
    • https://jezilifubi.weebly.com/uploads/1/3/4/8/134887413/pivawozanebesamoxan.pdfIn PDF document text
    • http://smartcreditscore.info/tippmann_a5_e_grip_firing_modes4jvyy.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/7453221.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/87598872676.pdfIn PDF document text
    • https://namovanuzo.weebly.com/uploads/1/3/1/6/131606642/4004875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://segisubab.epizy.com/63204611058.pdfIn PDF document text
    • http://xipebaduva.epizy.com/how_to_find_my_starbucks_partner_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af27302-cefe-4439-a44d-ab56c7cdcede/36473930318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6bd766d-1e07-4594-a58b-0b33a3da1d05/how_to_clean_coal.pdfIn PDF document text
    • http://fodakobenolam.rf.gd/nervous_system_flow_chart_answers.pdfIn PDF document text
    • http://xipanizi.myartsonline.com/dont_worry_everything_will_be_fine_meaning_in_hindi.pdfIn PDF document text
    • http://tulifal.onlinewebshop.net/urinary_catheterization.pdfIn 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_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 5496 bytes
SHA-256: dd61ce68351878a12b6a65bf7b8624df2117d805547de9915a02f9ad9ce305d5
font_01_sfnt_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 10840 bytes
SHA-256: 86d8a5e850a01fd85f836cbe9d09f3722f2b0dbc157a9caceb1569bc40487bd2

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