Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b6b5db4b6da84a…

MALICIOUS

PDF

74.7 KB Created: 2021-05-03 13:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f454e2d51d75d48320c1456d2e816343 SHA-1: b27dc1fe40fc2797c82632b778032d55b232c537 SHA-256: b1b6b5db4b6da84af6d756ed18711c42523b8cfca4d1cab0e32a1e56526403c2
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a high-confidence ML detection and ClamAV signature for phishing. It includes an external URI and a redirector link pointing to 'jumiwimov.ru', which is associated with a free-download phishing lure. The document body, though partially corrupted, mentions 'Winbook tw700 windows 10 drivers', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/strik?utm_term=winbook+tw700+windows+10+drivers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476767/normal_603872e16f08e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493545/normal_6000a4bcb250e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_606740900d79e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_6058f0a8e34ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_6040498f47a31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499651/normal_602d9d63d0a1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_600e6ed53a30c.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/6431113615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/69751643268.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/are_ketogenic_diets_bad_for_you.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/seed_germination_test_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/magic_chef_dishwasher_old_model.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/bovidogivewejugatir.pdfIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/how_to_sell_management_consulting_services.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4855c4ab-f772-492a-988a-be85d690414b/gamivufiwovazotadufidikuw.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/97648380491.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/zibobigutuxilifixuve.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/80085097574.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/mathematics_textbook_for_high_school.pdfIn PDF document text
    • http://sajatuvireguta.atwebpages.com/afasia_motora_y_sensitiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70f7b32-a720-4dff-b25b-627c78b05bc2/zuloze.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 5220 bytes
SHA-256: 5cc5d55942c6dfa8891792a4256e8dcfdd553a217938659d313e4f2017c865e4
font_01_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 11296 bytes
SHA-256: a39c8e7923b123e31d8c4f2ee153820700c74f942a63012bcfadc9426e447811

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