Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b128c0a13e4acb0…

MALICIOUS

PDF

80.6 KB Created: 2021-06-01 18:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 47570fc665d13257f11be27520ff024f SHA-1: 90c8b425094422b61bd19a3ad1ad8aac0ea2b404 SHA-256: 3b128c0a13e4acb0de8b6189d8d4a9e83c9fcaf8f2a4acf75989713136ede0d5
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to identifying vintage cast iron, likely to direct users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/pbw?utm_term=how+to+identify+vintage+cast+iron PDF link annotation
    • https://tovimovu.weebly.com/uploads/1/3/0/9/130969206/270d5ceea0203a.pdfIn PDF document text
    • https://ridegagix.weebly.com/uploads/1/3/4/6/134668883/ginoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5fe8e9aeef76d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413374/normal_5fe3818d777a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_5fd627aeef819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_60382f4e2b2f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_60218f978a690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382421/normal_5fee3cda60a2a.pdfIn PDF document text
    • https://kotidureguk.weebly.com/uploads/1/3/0/7/130776457/zegamineva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473035/normal_5feb0fe9a67d2.pdfIn PDF document text
    • https://kakadolaronenun.weebly.com/uploads/1/3/3/9/133997154/tavifafijalujimaxej.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://wojipag.pbworks.com/f/starbucks_barista_espresso_machine_instructions.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/doraemon_nobita_and_the_birth_of_japan_2016_full_movie_in_hindi_youtube.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144443697/wiluveta.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144467409/65275074014.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144462102/79816963475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20007d9f-7b05-438c-8d55-af2dc16a8cb8/fuxap.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144428889/fifezokitomobabowita.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/vapikeguf.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144442281/sigozidukewow.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/f/what_is_difference_between_histogram_and_bar_diagram.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/89848346711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7cb6528-b943-46d9-b638-aa2d060a8de2/85150202828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f04927-bd63-4455-a38c-59bced0313d4/gereruz.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_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 5160 bytes
SHA-256: 5dd9393e3464da7348b608a3c3295bf7d262d3a42b4d8fa3ac251b4c41837209
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 10532 bytes
SHA-256: ed45cb5ebfa41c3f45a6cd600db94a1afa6391b5b2b61c41986312e82f45bea1
font_02_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230