Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6d94678fe0d656…

MALICIOUS

PDF

80.6 KB Created: 2021-04-04 23:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3cecb326acac493803eb17c52770d77 SHA-1: d6029905250dee408fe7214bf2c60bbb8c9e4c3f SHA-256: fd6d94678fe0d65625f812cfd6e25b402c212bd1ebbf4bf25063458d5a187139
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or redirectors, suggesting a link farm designed to drive traffic to malicious sites. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.
  • 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://yafferge.ru/123?utm_term=tamil+movie+attagasam+full+movie+free
    • http://desokore.medianewsonline.com/golds_gym_xrs_20_olympic_workout_bench_exercise_chart.pdf
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/fa64477.pdf
    • http://risimog.mywebcommunity.org/belajar_bahasa_arab_lengkap.pdf
    • http://mezogevap.mypressonline.com/64981038735.pdf
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/rizebesipofege-pulegezarikup-mazofebi.pdf
    • http://kawafopi.mygamesonline.org/anaesthesia_for_veterinary_technicians.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_29b08fd05ede4e9fb239c9ef345045c7.pdf?index=true
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_ddc26d5394ff4c7d9b52e7af20c44c9d.pdf?index=true
    • http://molagegivijoxu.onlinewebshop.net/blood_relation_questions_bankersadda.pdf
    • http://luvepel.myartsonline.com/bone_broth_diet_plan.pdf
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_628d61a785394f33b60facdf994d53ad.pdf?index=true
    • http://pebomotixot.myartsonline.com/81269329319.pdf
    • https://s3.amazonaws.com/tuzakifezara/97420533206.pdf
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_93eef21b2d894c6ca9e5bf6e73e2f906.pdf?index=true
    • https://s3.amazonaws.com/gogoxowiniza/imagenes_del_sistema_muscular_humano_y_sus_partes.pdf
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_8281766ac26544b4b3f6e575aa3b584a.pdf?index=true
    • http://sazebufaz.atwebpages.com/jurnal_bilangan_bulat.pdf
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_78ffac8334ed4599921f31bbbb315829.pdf?index=true
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_993919c1305e423a885c373c92266282.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89e.bin
381592b6edfa93299b2941246077c3756b8f41287454a4afcbda2297a67b6506		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 5096 bytes
font_01_sfnt_off0000f9eb.bin
300ba7f104c42cd2c019fa8a60cee6f2d45d622c4c0fcf47087cd5b977319f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 10880 bytes
font_02_sfnt_off00011f8c.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 16164 bytes

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