Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bfd16f70f11e4f…

MALICIOUS

PDF

76.4 KB Created: 2021-03-24 01:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bf696d1465a1b5acad86856f24a92346 SHA-1: 9cf77278c0413c79b9830fc3b4064662858e2eb6 SHA-256: 46bfd16f70f11e4f382a1ff2ef34e61ade7c21eef9b0ba6cecc77b729005a4fd
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 pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=united+states+postal+service+history+wikipedia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402519/normal_604e9dee62523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_600d5de610e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_603c1db895701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5fcc4c198447e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417306/normal_5ffc939dc060b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b49c37f-e8cb-4125-9024-c1476e481ea6/how_long_is_the_texas_written_driving_test.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/associations_incorporation_act_2015_information_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d818ca6d-ba6d-4edc-836b-4c050ec8cbe8/roderibuzejijosudi.pdfIn PDF document text
    • http://tazidafez.rf.gd/76170991799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2407e3fe-16e3-4e1a-9358-2683addb46ec/difil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718ebcc6-2481-4fad-adcd-0b33467fe18e/wendler_531_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/88457202627.pdfIn PDF document text
    • http://fatofugo.rf.gd/avast_security_app_android.pdfIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_58aa492e6e744de59d0fe807e23bce59.pdf?index=trueIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_76f1f45b9a95404ab91115fb754da2d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a7bc63-0a5c-4de9-8a76-a0be118929a3/what_can_i_eat_at_el_pollo_loco_on_keto.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_b79dce5677b545ce87c0cd062872d65b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/twitter_banner_size_template.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_abc25e7a5a134ec88473b710c485a42e.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_05db75c4c05d46348a191bcd96b5d775.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/37922375813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13960fd6-65af-4a87-8f7b-26f9514d5226/48625136992.pdfIn PDF document text
    • http://lujovaku.epizy.com/alphonse_allais__se_tordre.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_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 5472 bytes
SHA-256: a8ed3836384445a78f697d6251d3ff79b4023953fa330bd76a0c3430c35e7aa1
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 10732 bytes
SHA-256: f5269515a2ea94a5db2c8517a35d9e2de86f269ce359b10207a1882396455aee