Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf50d9a21a609122…

MALICIOUS

PDF

87.9 KB Created: 2021-06-12 06:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cc84b4d305f4fac4ec2acc7489d96ed SHA-1: 5081d1db2e3ff60cdb3b4eea8e10d5d03b6d67f8 SHA-256: cf50d9a21a6091229a617bb50b84327aeb35a7bd3a821545431eb38d7968d526
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are to benign-looking documents, but one link points to a suspicious URL that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest it's designed to redirect users to malicious content, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/pbw?utm_term=projectile+motion+worksheet+answers
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/6060152.pdf
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/d015530e062.pdf
    • https://mobuzuwatajol.weebly.com/uploads/1/3/4/3/134310732/2099951.pdf
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/xizudomozulogoraver.pdf
    • https://ninofupefuf.weebly.com/uploads/1/3/1/8/131856131/serav.pdf
    • https://werobipopopavuv.weebly.com/uploads/1/3/1/1/131163729/3097594.pdf
    • https://lutenowunag.weebly.com/uploads/1/3/4/6/134627800/dapoburos-wejunexurinim.pdf
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/nibepujomipozi_darewal_gijuludeb_tojobabubosapol.pdf
    • https://juwavade.weebly.com/uploads/1/3/4/5/134526694/6759621.pdf
    • https://vunatoja.weebly.com/uploads/1/3/0/7/130738644/5847957.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8865e4cf-9e09-456e-8730-4c278b432c3b/how_do_you_know_if_something_is_two_tailed_or_one_tailed.pdf
    • https://uploads.strikinglycdn.com/files/c612369a-1f79-459f-a13f-6f274887239a/mirugapaxapimumupubib.pdf
    • https://uploads.strikinglycdn.com/files/19ad10f0-3cdd-4962-a53d-8ca09c8bbcd6/berekomusidipaxopu.pdf
    • https://uploads.strikinglycdn.com/files/995c621d-0ad3-4310-90bc-5c0be7c77c99/kowenododupovopew.pdf
    • https://uploads.strikinglycdn.com/files/15a79361-f568-4e9a-92d0-3c2e9c0bf92d/what_does_snuggle_bunny_mean_in_slang.pdf
    • https://uploads.strikinglycdn.com/files/ccf5f572-6ef3-44e0-b250-80e777f4551e/42336352259.pdf
    • https://uploads.strikinglycdn.com/files/0c45e774-cc77-4d16-9c63-b40589cc3f60/the_rule_of_three_book_movie.pdf
    • https://uploads.strikinglycdn.com/files/d096f2ac-eec5-475a-8dcb-3d3bac2bf7f0/dodedituvafajejad.pdf
    • https://uploads.strikinglycdn.com/files/72669cd6-3332-4967-ae1d-1af9b7a31804/how_to_scan_a_document_from_hp_officejet_4500_to_computer.pdf
    • https://uploads.strikinglycdn.com/files/7bfef0f8-8803-4478-ab6d-2ed7ed2c403e/bemolaj.pdf
    • https://uploads.strikinglycdn.com/files/3aa89a30-261f-45a7-a4fa-1fbcaae50e7d/xaxifowolizuvisubeg.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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010401.bin
1473cc4111ff0491b958b29241d0464923aaa617f78c8df1c3efaf2e9bef1741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 5272 bytes
font_01_sfnt_off000115d2.bin
de81fa3de2d5449fe4de4835c0ac6d2435b14e3f79a3ad22fbdd4e28b832011f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115D2 11120 bytes
font_02_sfnt_off00013c2e.bin
70180b97a9b9fe0de1e0c05b06d733d04658c9f7a2923a3eee6842afe753d47e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2E 16152 bytes

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