Malicious PDF — malware analysis report

Static analysis result for SHA-256 1462c7bc5fd910ca…

MALICIOUS

PDF

76.8 KB Created: 2021-04-06 17:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 404782d547ad52e1dbe992563ef982bd SHA-1: 2527df5fd86464f90f5adf21f0e7022eec21a9ec SHA-256: 1462c7bc5fd910ca7f088ae647f8e53c4298183b06f4bba82a8f7e550dc1728e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary link pointing to 'https://seumenha.ru/strik?utm_term=how+to+reset+kitchen+scales'. This, combined with ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and ML classification, strongly indicates a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and external links suggest a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=how+to+reset+kitchen+scales
    • https://cdn-cms.f-static.net/uploads/4451206/normal_60515a6c8ea8e.pdf
    • https://cdn-cms.f-static.net/uploads/4475988/normal_601bb5f6b7fc2.pdf
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/gumas-zonopofamiro-bugowebitole.pdf
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fe923f871222.pdf
    • https://cdn-cms.f-static.net/uploads/4455375/normal_601e694588665.pdf
    • https://xupijologa.weebly.com/uploads/1/3/5/3/135327862/6573337.pdf
    • https://cdn-cms.f-static.net/uploads/4421462/normal_60491837183b2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/42872360-b7c1-4630-a6bb-615f8df61f2c/tabonikezoxinibu.pdf
    • http://runijagaf.rf.gd/logical_fallacies_worksheet_high_school.pdf
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_0ef555045557439db4cd532ef100917e.pdf?index=true
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_99ddd418e3d1454ab843a4ad6c8172eb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6bd3d28-98cd-4332-b3ef-825a07ae0f6f/how_long_to_boil_sweet_potatoes_whole.pdf
    • http://nuposim.rf.gd/56443445153.pdf
    • https://uploads.strikinglycdn.com/files/dddcf1bc-4219-4a3b-98d0-9f369b0151db/welding_for_beginners.pdf
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_513f74759d1c408486cb53e0555c6bef.pdf?index=true
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_af93567c43514c2f843624587e203040.pdf?index=true
    • https://uploads.strikinglycdn.com/files/44647db8-7493-4b3c-bd0f-f6479fb543c6/kapakaxozujapudoxibo.pdf
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_0ef538b05a684402a249f272744cb99c.pdf?index=true
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_c39097fe909242a38f2dd9674ce32355.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02f.bin
748c9481e9a5541fa7bbd3785510324abac0a27fb6e5ec0b535a7e5605268f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 5004 bytes
font_01_sfnt_off0001013e.bin
114bb788a008232e2bada66e14f48d42e716e9237846d7aa54896e66925eb6c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 10908 bytes

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