Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b5098800cf8c40…

MALICIOUS

PDF

69.5 KB Created: 2021-03-12 06:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e9426ac5e0299907eb1152550d6eda4 SHA-1: aea9666931dd50e27f5300a43dd748753779e7b8 SHA-256: 60b5098800cf8c40f354dff16cb15915dae80caace3f60190c027ec0795b4eae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, with the ClamAV signature pointing to phishing and trojan activity. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely leveraging spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=evaluating+piecewise+function+worksheet
    • https://cdn-cms.f-static.net/uploads/4423700/normal_601555f6dac6c.pdf
    • https://cdn-cms.f-static.net/uploads/4489994/normal_601e2491cbec2.pdf
    • https://cdn-cms.f-static.net/uploads/4384819/normal_601207cc56aba.pdf
    • http://pamatidela.getenjoyment.net/lolawakepuzexisedubugeb.pdf
    • https://cdn.sqhk.co/datimemovuko/iffjil7/54008127984.pdf
    • https://static.s123-cdn-static.com/uploads/4417137/normal_5fdfb1619d6f7.pdf
    • https://cdn.sqhk.co/nudofarus/f6HbhgS/41444474627.pdf
    • http://bagerisevi.scienceontheweb.net/zemaker.pdf
    • https://cdn.sqhk.co/vomuvojovi/jedpqia/expanse_cast_season_3.pdf
    • https://cdn.sqhk.co/nisikevepoxi/jeMWxgd/wazemivigibisarula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zurovajij/gimp_layer_mask_from_image.pdf
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_6eadeefb62ae4a64969df19b02542ca7.pdf?index=true
    • https://s3.amazonaws.com/lodazojamuva/printable_christmas_colouring_sheets_for_adults.pdf
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_a78d458ed44a4bae9d436ed2f35c5cd0.pdf?index=true
    • http://zepizevut.atwebpages.com/physics_for_class_9_sindh_textbook_board_download.pdf
    • https://s3.amazonaws.com/wekibik/xuvekovajaw.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_12a83857b8c34579bf192e57cc372c1d.pdf?index=true
    • https://s3.amazonaws.com/boxujetanonikuv/diesel_jeans_mens_size_guide.pdf
    • https://s3.amazonaws.com/tuxutedi/ischemic_hepatitis.pdf
    • https://s3.amazonaws.com/lofese/gakesav.pdf
    • https://s3.amazonaws.com/laginekux/best_bulk_sms_platform_in_nigeria.pdf
    • https://s3.amazonaws.com/vosimalume/linear_guide_blocks_and_rails.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf3c.bin
325f31476c3ce61ed6f6d9b7ed99a8b98738bf0e4106d8d9065404e34b291262		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 5452 bytes
font_01_sfnt_off0000e1e0.bin
71fa7aaddf79b75f72704c91e1bbffcb1ab7ec381e94904e722765af051f49ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 11280 bytes

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