Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f271fba986affe…

MALICIOUS

PDF

78.4 KB Created: 2021-02-20 18:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cac90a13b79c6fb0586b7f1f7719dd68 SHA-1: a7885a8b246941b3d4eeaa8b44a185904ec6058f SHA-256: 23f271fba986affe5d62d8aad7d3c7999363fdf53fe6db3fb4f5b2ebab091b6b
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs 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://seumenha.ru/strik?utm_term=g-shock+gwg-100+mudmaster+with+tough+solar+%2526+multi-band+6 PDF link annotation
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/6551159.pdfIn PDF document text
    • http://markettop.pro/fordlandia_ielts_reading_answer_keydxdz3.pdfIn PDF document text
    • http://jakor.pro/150878695194w8wh.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/hb0hRGL/57129869396.pdfIn PDF document text
    • http://fringigejy.site/7104744004k0xz0.pdfIn PDF document text
    • http://frasqen.online/applied_science_diploma_2nd_sem_notessljfj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469353/normal_6005407093af5.pdfIn PDF document text
    • http://pinerapidsrr.com/minezaferaxuzeraxabogorehek0h.pdfIn PDF document text
    • https://cdn.sqhk.co/fowurona/i9Qijgh/jelekojarubopofuzibew.pdfIn PDF document text
    • https://pajobujanij.weebly.com/uploads/1/3/1/6/131606923/2992351.pdfIn PDF document text
    • http://petersikdar.com/912935918224szub.pdfIn PDF document text
    • http://keep-travel.com/easy_four_hand_piano_sheet_musich2wxz.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/bofake/rise_up_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/tabela_simples_nacional_anexo_iii_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/project_discovery_phase_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/92942504964.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_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 5544 bytes
SHA-256: 5b4242f5bfd399115b2fd2f7121de1bac8acd0a50586e52c93bc2eb7ce84b8f5
font_01_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 10512 bytes
SHA-256: e187de09ec61c7aa03c45415795db47143eb41a0b1f382aacc3032b5e225bf8e
font_02_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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