Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a800e0e8b939b11…

MALICIOUS

PDF

96.6 KB Created: 2021-03-21 01:29:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6088fc36fac5098bac29dd5f686949c1 SHA-1: de8715c574dfd1015d7950487ca7de8fd02ed5cd SHA-256: 3a800e0e8b939b11977b2c62e283cbbd33ab9a32474d014c457e823a092a2750
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 by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=cuidados+de+enfermeria+en+atresia+esofagica+pdf
    • https://cdn.sqhk.co/kutogudofi/fMHgcPY/horizon_credit_union_membership.pdf
    • https://cdn.sqhk.co/torazanopuni/iegiiey/emergency_alert_system_today.pdf
    • https://cdn.sqhk.co/remozemot/jdhjrZr/marco_s_pizza_las_vegas_warm_springs.pdf
    • https://cdn.sqhk.co/tovipovo/fZj4Rid/pibus.pdf
    • https://cdn.sqhk.co/ninoporaleva/yWi9ib8/18337432399.pdf
    • https://cdn.sqhk.co/waximanodif/CQjjhid/nfl_fantasy_football_draft_board.pdf
    • https://cdn.sqhk.co/puxolika/cjajiht/5736009654.pdf
    • http://boribonabone.mypressonline.com/carnival_dream_deck_plans.pdf
    • http://knitfqph.site/moving_announcement_postcard_templatevr1s0.pdf
    • http://mastericy-chistoty.ru/tulubitimonefanmroy.pdf
    • https://cdn.sqhk.co/xunijejozi/jwGxgfE/zumakijov.pdf
    • http://tiwimifozukimu.medianewsonline.com/mathematical_induction_free_download.pdf
    • https://cdn.sqhk.co/vemudumuxixu/Fhe5mig/xexedomux.pdf
    • http://bestpriceforukraine.xyz/dunkin_donuts_caramel_iced_coffee_with_almond_milk_calories_smallm6o4h.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_89fe2d5c7ebd460fab041ee2053e041b.pdf?index=true
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_92567dead477406992e87c824fd6e0ab.pdf?index=true
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_1fb636dbc7094ec28fdb191515d46606.pdf?index=true
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_7d5f864f28874f428bd0a9bba37b027f.pdf?index=true
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_5ba60adc8caf47208767e2ef044f1d02.pdf?index=true
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_5622bbd449254fc0a3c116d801699629.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d77.bin
6673ce82750cf30ee8dd87f0b02d97d771ee1f1fa240fdd328d28b8cfa10f546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 5348 bytes
font_01_sfnt_off00013f97.bin
0c86fe33dfda1e4e05e7cf395e01ec4d90e444859aed42ff7f3b4aa6d6503e6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F97 12004 bytes
font_02_sfnt_off000166bd.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166BD 4324 bytes

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