Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd1d03d89bf36a1…

MALICIOUS

PDF

80.1 KB Created: 2021-03-29 03:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b68b9dee3a8454ea9e50f12a1efe0565 SHA-1: 4b2319feb1ac8e7f6a427a21fc75b6aa00c8dd73 SHA-256: 1fd1d03d89bf36a18f25a8b827c61f4c2d555a46ec68c9c0c097c834fd8ae0a7
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving luring users with deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/award?keyword=resignation+acceptance+letter+sample+pdf+uk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408993/normal_5feb7239db543.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/sparx_shoes_catalogue_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_603ee07eb1bf5.pdfIn PDF document text
    • http://bezerojiw.scienceontheweb.net/annabac_maths_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_602464710babd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447878/normal_5febb30ebbfe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_60438aa6dbe21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_602c5f146ce9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5fd7d129a5c7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_60465bb2d890d.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/6960d891-ebb1-45c9-adc6-262f234dd0ac/what_is_a_onyx.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_01a56f345d834e65b4f207f7e2dee3a9.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_204964fd3de0407499f7d48e5d260c6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3c05d9-00c9-49ce-879f-133c85cf3558/tissot_touch_titanium.pdfIn PDF document text
    • https://8a05da06-75fd-4b4b-8779-f7668a2fa4a0.filesusr.com/ugd/da32d9_7935c40ee77d4b138591ce3d8de815d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/natatubepej.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/us_army_flag_patch_upside_down.pdfIn PDF document text
    • https://2b4b9a66-705d-4e40-a31d-28d4db190467.filesusr.com/ugd/1dbb98_3d724be2ffa14b309900f1f74babf223.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezorito/70528707248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a71ba0d-27ed-48a2-8035-7fe62b3c27cf/speed_drawing_challenge_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/91852375600.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_65728c6b6b0b4a4da8cb30b61f943545.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/adae4684-61e8-4ec8-ae26-151c7f65a625/subak.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_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 5544 bytes
SHA-256: 0167c043acf67ed9acaf51152051d8560a9320986b3f63df2936b0b75590bad7
font_01_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 10492 bytes
SHA-256: 0d96085136c3ed8ea0dcbf7a351b267b100e985411def302b70ede431f2efa6c