Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf3c791e14aa883…

MALICIOUS

PDF

72.5 KB Created: 2021-01-09 23:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 57970d098aa7e6905dc0c5e88e87c9d0 SHA-1: 88e05cf3b7d1f3834222c3299d5c7b69f362374b SHA-256: 1bf3c791e14aa883fa4a0a2f216da725803224c4c468f4aaa838ccf4af0f3a39
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically linked to 'sheet music' and hosted on a domain flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=sarabande+handel+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469126/normal_5fb6a0362b123.pdfIn PDF document text
    • https://vivutavolid.weebly.com/uploads/1/3/4/3/134308799/bixol-vosavane-wijukuzox-maxiwis.pdfIn PDF document text
    • https://site-1174029.mozfiles.com/files/1174029/business_plan_template_word_south_africa.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/3448931.pdfIn PDF document text
    • https://tozijaletaxe.weebly.com/uploads/1/3/4/3/134312516/rimupitigafip-mitesu-jemoseludenaba-wamix.pdfIn PDF document text
    • https://site-1173925.mozfiles.com/files/1173925/7602396348.pdfIn PDF document text
    • https://fozivumi.weebly.com/uploads/1/3/4/7/134761275/jokigimitux_kebuxufokumalup_tuvikokedaz_zamunu.pdfIn PDF document text
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/6231560.pdfIn PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/nadelixudil-filokepejo-pigawazaku-navugapemifodu.pdfIn PDF document text
    • https://jesebumu.weebly.com/uploads/1/3/4/6/134617302/4963126.pdfIn PDF document text
    • https://site-1178022.mozfiles.com/files/1178022/19738633632.pdfIn PDF document text
    • https://site-1175580.mozfiles.com/files/1175580/cracker_barrel_locations_by_state.pdfIn PDF document text
    • https://site-1166680.mozfiles.com/files/1166680/58659145547.pdfIn PDF document text
    • https://site-1167973.mozfiles.com/files/1167973/logiciel_schema_electrique_mac_gratuit.pdfIn PDF document text
    • https://site-1194964.mozfiles.com/files/1194964/20816758551.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE57 5192 bytes
SHA-256: 84a911a51a0c0a51a091d6a7888246d769358805db1b656f6dea6570fcad50e3
font_01_sfnt_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 11544 bytes
SHA-256: 658b89e85d9970d98b128fd4a62bab1bc498dab2089d6c84869b134e37111abe
font_02_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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