Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a566ec0e9f3946a…

MALICIOUS

PDF

74.0 KB Created: 2020-11-25 14:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24d77e22112405d972557c8183b10f70 SHA-1: d0a7131d6e7a73d6853e6dd28efa464db8125e60 SHA-256: 3a566ec0e9f3946aeba559c8941cd5c284c7d5b9d9b163d5f54fb5f88836dc30
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to various sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/strik?utm_term=8-2+the+pythagorean+theorem+and+its+converse+answers
    • https://xoragawamu.weebly.com/uploads/1/3/4/6/134666694/c1ebfe1a3c.pdf
    • https://norigawe.weebly.com/uploads/1/3/3/9/133988483/dodikagisavizo_webunusupok.pdf
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f9d6d56ef7dd.pdf
    • https://femekeviwafuga.weebly.com/uploads/1/3/4/3/134345727/0fe64ad055be1d8.pdf
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5f9a8d2a2174a.pdf
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/mufaletodopo-kamuzaximawep-xefuni-borirade.pdf
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/gulavidijo.pdf
    • https://cdn-cms.f-static.net/uploads/4490127/normal_5fb62cbcebd52.pdf
    • https://wibanakipose.weebly.com/uploads/1/3/4/3/134361509/3f5562abe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c70267bb-89b6-48cf-b62c-f82be7763119/93365515325.pdf
    • https://uploads.strikinglycdn.com/files/e1587647-3131-4a38-bf31-04a426f46588/ifrit_hard_tank_guide.pdf
    • https://s3.amazonaws.com/netinuwa/vimoritadivararokuref.pdf
    • https://uploads.strikinglycdn.com/files/9ed57e20-bb6c-4b3e-ba21-56d8a9208ba8/easiest_government_contracts_to_win.pdf
    • https://s3.amazonaws.com/zizene/business_finance_exam_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/71355a84-0cc2-4045-aedb-c826b3679a79/kusatepiniwibekebumopupo.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_off0000c754.bin
eb8ef61bfa0b655840d7f241d91bd8db97ead4be84867738b4aa8bd21f202ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 5972 bytes
font_01_sfnt_off0000db9b.bin
0140f62a5e3f60902f5e06a402435384530431ce4cf89688321179de29cfa337		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 12500 bytes
font_02_sfnt_off000103cc.bin
43dd7310e986e37c0562d6efd2a67b6291a0d41fa892ecd43b306c3e7231f7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 16148 bytes

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