Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9072f8e39735d5…

MALICIOUS

PDF

73.0 KB Created: 2021-03-15 03:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2dd239d03426527f1e3d30c4c1d2262a SHA-1: b7fe5f6aadb244ea77bd1a71943c1903d46ee311 SHA-256: 8f9072f8e39735d5ce73e4e1fb8c71dc9432f3e983824412eab6403c52e3d169
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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://kuzutuzo.ru/award?keyword=bralette+pattern+pdf+free PDF link annotation
    • https://cdn.sqhk.co/morureju/ZFthfMk/tifodexaribo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404299/normal_6034f38d9409a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411922/normal_60131f44d402e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5fee86fa3e8ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_600ff9ee6bcd0.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/911_episode_alone_together_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/ie6nig1/87766282982.pdfIn PDF document text
    • https://sudusiwigi.weebly.com/uploads/1/3/1/0/131069987/daneg.pdfIn PDF document text
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/3037b76cfff7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414495/normal_5fe4efb290658.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/ic6cgcb/city_sightseeing_berlin_map.pdfIn PDF document text
    • http://migasoloraluxuj.scienceontheweb.net/nexa_baleno_accessories.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea73befe-1e0b-4ce5-b09f-23cdba3e6fd9/one_punch_man_blast_is_saitama.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/54841593254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a3206c-b1f3-4328-849e-f3d4261b6e45/how_to_read_a_massey_ferguson_serial_number.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_0e535e19263048ad9daadd3b7c1d6e99.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_1b175c4a56134c35813dc57da945ea0d.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 4908 bytes
SHA-256: 15fd090febed891f6f3b6dac08a496c1282f46d45f0753e32c6248820f7b6999
font_01_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 10816 bytes
SHA-256: a8be302bb2a38589b19f358e10bc51531757ac9c77765d2fe8d2912ab5b17c73

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