Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b63cec11ac6303…

MALICIOUS

PDF

71.0 KB Created: 2021-05-17 08:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2f0aceb76b882aef5a2b089d4e04d4a5 SHA-1: 48e8de51ac84a40f413a2e79e28d63d94b519f81 SHA-256: 46b63cec11ac63034c6851cb2845f8040ce5aba22df9b3af1a2f5a9fbdfc68f2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/strik?utm_term=how+to+put+together+a+sauder+5+shelf+bookcase PDF link annotation
    • http://ryursew.space/laxutemvfs2k.pdfIn PDF document text
    • http://jogemijafiw.22web.org/sample_answer_to_complaint_federal_court_california.pdfIn PDF document text
    • http://idealica-columbia.site/date_format_linux_command_linesyk3n.pdfIn PDF document text
    • https://pipedexow.weebly.com/uploads/1/3/4/8/134852679/nugofogijeditixub.pdfIn PDF document text
    • http://panedapupugaxe.22web.org/acids_and_bases_experiments.pdfIn PDF document text
    • http://normaa-id.com/gupavdj77w.pdfIn PDF document text
    • https://ranelelopo.weebly.com/uploads/1/3/1/3/131380755/sujev.pdfIn PDF document text
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/worilobozizigezapefa.pdfIn PDF document text
    • http://eurostore.info/write_a_short_paragraph_on_my_favourite_animalms5yw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wewalegomujisos.rf.gd/sinumolesorodaruvinute.pdfIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_d9557a1a692f499e9c8cd43d9b35eed8.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_0cbb3d98b3e64278a6c4176d929a6c6d.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_cc9944aa619544c4a5738a58870bd646.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7445bb11-dbd9-4920-b305-c25747e72b0e/what_to_use_to_clean_a_saxophone.pdfIn PDF document text
    • http://menibawegopu.epizy.com/biodegradation_of_xenobiotic_compounds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7b6518-64e6-4310-9882-774dade5ddd4/80033142242.pdfIn PDF document text
    • http://sozofini.epizy.com/agreement_of_verb_with_subject.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0db76d8-bc01-46d8-afe9-8b5ea66e3eca/86700598278.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_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 5800 bytes
SHA-256: 6b2c19171588f93b1ec649e791422e3bdac4b4e6c0374b59774c1dc1e5697405
font_01_sfnt_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 11012 bytes
SHA-256: 9277545fedde21974522c6962531bbc86de28d55f6bf532cdc5ec57c39c6755c

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