Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8db652d2b85f954…

MALICIOUS

PDF

82.9 KB Created: 2021-03-27 17:39:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d8dbe64dcb606951222e36f73334582 SHA-1: 954f408e33d456f8be7ec11533ccc82ff70a01a0 SHA-256: f8db652d2b85f9546636d19619a80bb19c58f095ae301c4e05d08e54d0cf85b7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/wix?keyword=modern+home+air+fryer+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409798/normal_604e58bacd6ab.pdfIn PDF document text
    • http://extraevents.ru/a_street_cat_named_bob_book_age_ratingwjn5z.pdfIn PDF document text
    • http://dontbeshy.xyz/bexatelustexbl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366319/normal_5fe532f549c8a.pdfIn PDF document text
    • http://vashastrahovka24.ru/how_to_use_lg_washing_machine_tub_cleani8uah.pdfIn PDF document text
    • http://amin-ukraine.net/delulorimukafixo6nhf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5fe207261dff3.pdfIn PDF document text
    • http://gloslides.com/what_questions_to_ask_in_a_secretary_interviewgng0g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479213/normal_603e0d3999400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tirisesu.onlinewebshop.net/20327401456.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/le_grand_livre_de_l_astronomie.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_0ec8952225de4458b92b9df4f8fc550d.pdf?index=trueIn PDF document text
    • http://powagamojij.onlinewebshop.net/63475188175.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_9317932d763b4acdba19c4da487f7539.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/85979893093.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_6040afb843d64273a8e49b305ec67c87.pdf?index=trueIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_f5708e0e5d244c2aacd809e8afd47506.pdf?index=trueIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_a346d80d613346129f784844eca57eb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/zeledumonixiw.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/hyperoptic_router_user_guide.pdfIn PDF document text
    • http://vedixemalirugi.atwebpages.com/14669394214.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_0275afa63ecc4b538b37073f58d82f11.pdf?index=trueIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_ac10057749654702beacae8ac5b36573.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_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 5076 bytes
SHA-256: 8df06393e02c633c288423a0db649106d9f790258ae3b65c2c6cae75c6c922f5
font_01_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 11532 bytes
SHA-256: cf59d9d923bde46b446df0f7920051751223ed55b4c604a1781262ecc6903786

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