Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f087bae940e11e8…

MALICIOUS

PDF

92.3 KB Created: 2021-06-06 17:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd3135dae7dce58c054353ea2ff63c30 SHA-1: 91a15fcb84d5634daca0c37219b6ab2e37e9f3b8 SHA-256: 9f087bae940e11e86345a59c09858a489c1b7153b35fe656931d6df9bff71875
156 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 Weebly and other hosting services, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/pbw?utm_term=learning+arabic+for+beginners+in+english+pdf
    • https://zotolujirerezo.weebly.com/uploads/1/3/4/5/134582396/xomutidiruxenipabo.pdf
    • https://mikutefax.weebly.com/uploads/1/3/4/8/134866710/javibo.pdf
    • https://wagelefukat.weebly.com/uploads/1/3/4/2/134265927/2b9c6dc5c4.pdf
    • https://cdn-cms.f-static.net/uploads/4426550/normal_5fe9cc61a79d7.pdf
    • https://temadugebunexi.weebly.com/uploads/1/3/1/8/131871621/3512772.pdf
    • https://cdn-cms.f-static.net/uploads/4422390/normal_5fdbb3f037f4e.pdf
    • https://livorenofog.weebly.com/uploads/1/3/1/1/131163774/malodabuseto.pdf
    • https://pejoguroboxifuj.weebly.com/uploads/1/3/1/6/131637830/7024655.pdf
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5fd3b4e75620a.pdf
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/9f4f4b435c.pdf
    • https://tenekitu.weebly.com/uploads/1/3/4/0/134018212/dufogag_fevagirufedewep.pdf
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/vuzemab_ruzetovajinovem_wotaxesilafo_lagezadoniwa.pdf
    • https://cdn-cms.f-static.net/uploads/4488092/normal_60b865beb1b71.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vakerul.pbworks.com/w/file/fetch/144696840/what_is_biological_preparedness.pdf
    • https://uploads.strikinglycdn.com/files/f1d25036-b0c4-4743-a888-ef91b9650c05/73388125223.pdf
    • https://uploads.strikinglycdn.com/files/ff2b2111-2649-4b9f-9a2b-bf99d62b5da0/bixer.pdf
    • https://uploads.strikinglycdn.com/files/b3487341-8416-4a9d-afed-d55f16325ff8/bukumobowapopabuzopabi.pdf
    • https://uploads.strikinglycdn.com/files/5889935b-7c2d-4557-a9ee-a5ad2e93507a/xenyx_x2442usb_manual_espaol.pdf
    • https://uploads.strikinglycdn.com/files/0a1ac797-195e-4acd-ae49-26f6f4059e80/7_times_table_worksheet_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/51bf305a-7c59-483c-8863-282c833d9152/ponugonerebebuve.pdf
    • https://uploads.strikinglycdn.com/files/cb20f746-5cbf-4a0c-be6f-51d2f7ab9ee9/gijobiwugazolip.pdf
    • http://zezimin.pbworks.com/f/farimazaxunakefoju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013f66.bin
e779dd24228a519b30934fd2d19a1defa8367f8fe171ff5eee72d7161f3eec5c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F66 20964 bytes
font_00_sfnt_off000105d8.bin
8b71c60343c448f5c7c30bbddf412cfde233bc706e5676afe1186640ad67dfd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 5496 bytes
font_01_sfnt_off0001187f.bin
4694e8bbc38dd45c2331a1c88c2dea1de74e7618b65f048dbb7ff697642ff361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1187F 11520 bytes

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