Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd0d31dd4c36741…

MALICIOUS

PDF

72.0 KB Created: 2021-02-24 17:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 541f91633f77136fe8713d0f582197d4 SHA-1: 3b9ae006574f32329947b08b465467c9017189a8 SHA-256: fdd0d31dd4c36741fcdd5e3d93b693be2e29bb40be8ef834d43a24ed622ff548
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/123?utm_term=skilsaw+5150+blade+lock PDF link annotation
    • https://cdn.sqhk.co/guwuweri/6gfignm/world_hockey_champion_league_of_legends_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/gjhidx7/nogukelasekumojikozu.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/4iexWhO/72864367813.pdfIn PDF document text
    • http://honbiz.pro/room_decorating_gameso8yms.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/9xiiMja/xewizulomi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466166/normal_5fee87c5cf654.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/nauka_angielskiego_chomikujh6v29.pdfIn PDF document text
    • https://dosisusibifoba.weebly.com/uploads/1/3/4/2/134236234/bekiguxebela_narenapomuvijox_xisopin.pdfIn PDF document text
    • https://rejonogatu.weebly.com/uploads/1/3/5/3/135392998/rivimikomedaki-zesetegoda-gigagaxejemaka-sekinefezidu.pdfIn PDF document text
    • http://kulinar2020.site/dilajevoraniwiravodadokt04ys.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
    • https://s3.amazonaws.com/gurafoga/sapurumenov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 5156 bytes
SHA-256: 054e376caec07c258fa43598fd06756264259a26081daf0744107a1e4b5a9a27
font_01_sfnt_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 10340 bytes
SHA-256: f3d02b96ad5349284164df14601987e7f5602008057c272043be41120d17290d
font_02_sfnt_off0001050b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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