Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35fd3feb1d3db81…

MALICIOUS

PDF

102.9 KB Created: 2021-05-02 13:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a1aac99407eb0b6e7caf8a5c64d11a5a SHA-1: de1699a66efb27b396ee5ddd1d77e910a83c22f6 SHA-256: a35fd3feb1d3db81582a977d4dcf746f23f0fa3a8cdd32ef684e3f58d32f682d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, with a significant number pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=zero+bugs+and+program+faster+pdf PDF link annotation
    • http://urolog.xyz/92634111427qg63c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465010/normal_5fd8455e1ea4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412160/normal_6017d6ca6031c.pdfIn PDF document text
    • http://delaem-sami.online/personal_assistant_resume_summary_samplesg1itw.pdfIn PDF document text
    • http://callup.today/kenmore_elite_he4_dryer_heating_elementmcjw3.pdfIn PDF document text
    • http://solapp.xyz/surefezamatidqp2u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410952/normal_5ffe5fbec76bc.pdfIn PDF document text
    • http://idealica-italiaoficial.site/aocs_official_method_ca_5a-_40u6swm.pdfIn PDF document text
    • http://metryck.info/71237744517kj77a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408001/normal_5fcf206c3e1ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5fe094b307ce7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/pegev.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_bf43f67286624c2a8c349b5baccb9b7e.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_3f26178575454083a56dec1ec87edd1b.pdf?index=trueIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_607913c0aca040c0b965f1744b1be427.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/machine_learning_yearning.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_e351381ec54841d4808f6332a01994fb.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_dee51b86e10a4aea934992f5d59e609d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubata/sloan_flushmate_503_dripping_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/beeman_sportsman_rs2_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/2521967682.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_off0001513d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513D 5424 bytes
SHA-256: 2e6027f1772bf94cd336c10795b38c96e235d7fd602bb928b83996ba29c428d1
font_01_sfnt_off0001639e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1639E 12700 bytes
SHA-256: ad213bf1aebbc0050006d722b69fea7b1c6663265c351f2e630ac097fd33e38b

Open this report in the interactive analyzer, or submit your own file for analysis.