Malicious PDF — malware analysis report

Static analysis result for SHA-256 1732e5ac3a963af2…

MALICIOUS

PDF

78.2 KB Created: 2021-03-03 07:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f648df660d966360824e08f0ed89110b SHA-1: 1db2308654c47bca3f897b07cd4cc99de354e7f0 SHA-256: 1732e5ac3a963af20609db6418c5d891634a2ac7da6d959f6d45902e68224421
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one directly referencing 'appliance repairman' and leading to a suspicious domain. Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, likely phishing or a trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://pelibifir.ru/aws?utm_term=how+to+find+an+appliance+repairman PDF link annotation
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/619c950.pdfIn PDF document text
    • https://nuvipepive.weebly.com/uploads/1/3/1/4/131409498/pikubaluvopino.pdfIn PDF document text
    • http://bullbananavannaone.xyz/soundarya_lahari_telugu_with_meaning_free_downloadndphq.pdfIn PDF document text
    • http://spain50off.info/wendys_chili_nutrition_calorie_counte22o1.pdfIn PDF document text
    • http://medicalpracticementor.com/sezolezitudi8t1cv.pdfIn PDF document text
    • http://ukranews.site/the_misfit_of_demon_king_academy_anime_ep_12ub9ok.pdfIn PDF document text
    • http://safetymirrors.xyz/kujinupotuy8yf6.pdfIn PDF document text
    • https://vojosapixetogal.weebly.com/uploads/1/3/4/7/134770394/watudewasad_sebelup_gonajixag.pdfIn PDF document text
    • https://koxawobe.weebly.com/uploads/1/3/4/5/134528326/reweme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_603ed40d9269a.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/70337378178.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://supuwevul.atwebpages.com/xizasipikonivoronanidak.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/93047877863.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/bofakigeresulexazode.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/brs_pathology_8th_edition_download.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_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 4964 bytes
SHA-256: 75639b3bdedf058695df29a4a8da7c17ba5db6f3cce8ac06c327b942d1de7218
font_01_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 10888 bytes
SHA-256: f0c71b3e04baa9f1a02c3c4723d33f3bf25640f9ad90291be54f45ffa21672a2
font_02_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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