Malicious PDF — malware analysis report

Static analysis result for SHA-256 903fcc0730ea0a21…

MALICIOUS

PDF

77.4 KB Created: 2021-03-07 20:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c362328bceb2c8cb3f5e859b169ba956 SHA-1: b5c622016bd9bc8f5cb5ee2862159a3a914473f5 SHA-256: 903fcc0730ea0a219d5f57ba83cb989d48cff1d1ec4e22226fac837be6af692f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/wix?keyword=chapter+6+carbohydrates+study+guide+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416806/normal_6018b80b3cf69.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/dabewejoxojutemebas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_602f5d7c33a24.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/why_does_jocasta_kill_herself_in_oedipus_rex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381740/normal_5ffa27afac145.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/fujokepovaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_601c88a11c4fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424981/normal_5feb1b23af8d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_65ab16e8a2ec49138b4cf74df7a9c3fe.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_d0dba9de20dd4541bea6a0b10fb55035.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legipalofi/sexegozewivowe.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_8f7649e2640644849c2903f8ab540b01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/52191945453.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/visorajigunu.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_172fa098510e493bb22e4b8921b748b7.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_fc4d58336dc844f2a39f0026e10af4bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozuga/vaaste_song_mr_jatt_mp4.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_74842da99f6b455eb0c0944d9b82655c.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_0cfdddb015a04145a9de48e3c9571dec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jotizifime/bella_thorne_songs_free.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_e9f586530c564eb780df5f9d8a9c15a5.pdf?index=trueIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_84d45d9ee1ee4cdbb3a1c2f21aa751c3.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_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 5696 bytes
SHA-256: c02af6702a09593d7c1dedbb0e16db6f0568e4f0cf81f91b18704cd10632369b
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 10504 bytes
SHA-256: ad2bfe574fd54a45206ea3f00da2181753a93b954ebf557243b2fcd65fa2373a