Malicious PDF — malware analysis report

Static analysis result for SHA-256 f131e65b99e89d1f…

MALICIOUS

PDF

82.2 KB Created: 2021-05-06 07:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b73cde17d58000700c11a02e18eec95b SHA-1: bfc12262448f2b156a96a5ca718691832e9d8a42 SHA-256: f131e65b99e89d1fe337284cda7e08577ddf195cc16945ad574fedee6a8fcfc9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://nipisod.ru/strik?utm_term=washington+redskins+record+by+year PDF link annotation
    • https://cdn.sqhk.co/gugivusofed/iiglagg/ark_survival_evolved_xbox_one_update_july_2020.pdfIn PDF document text
    • https://serelikiwep.weebly.com/uploads/1/3/4/4/134476809/25780a95bcf59.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/evanijH/nezerefatexerekukiv.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/bvTe1ih/simosujaf.pdfIn PDF document text
    • http://januvasiw.22web.org/49610339331.pdfIn PDF document text
    • https://xusudunegowubub.weebly.com/uploads/1/3/0/7/130739081/botaginasebo_tilelumos.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/rivuverite.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/dggw3gr/29060883814.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/gfhfigc/keep_the_ball_rolling_idiomatic_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_0083fc5d72fa48a292c97772d8ffa2f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/blood_bowl_miniatures_scale.pdfIn PDF document text
    • http://gemakeruw.epizy.com/bebude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c16145c-cf5d-4a42-b3fe-d9ac8fd819e6/sekaxojav.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_5e0a6289def54147b3179ca1ffbbf11f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7deae85-527e-4f31-a2fc-81a13a8f3567/98996868135.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_8ad74773b85a4d0b8051592864c8ab1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zupenafud/child_welfare_information_gateway_adoption.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/sewawe.pdfIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_23fe04c7475e46faa4fb40ff60ece5cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3f365e-7e82-45c1-99dc-d8df92e01072/autocad_free_download_for_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbccc503-6be1-4987-af02-9a420aa98eb4/how_long_does_it_take_to_dehydrate_beef_jerky_in_a_dehydrator.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 5488 bytes
SHA-256: 1019fe3730701b29a5bad2997c843238ceec8d4b8686af0267433e298a331e75
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 11272 bytes
SHA-256: d50483635fa5b45c2838f474f9ec250e2f1acd04194976a37b77ef7d302e2a1d
font_02_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 16080 bytes
SHA-256: d7c0313d84b709fe8a6a90baca56b34c20eeda1db47cffc02c31991c89a68c0d

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