Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a74b4fa5c19c35c…

MALICIOUS

PDF

88.4 KB Created: 2021-05-15 16:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 65c61392f295d65c0dfb01fc0c75504f SHA-1: 76cecca79feca47db0e64e400bb235847d9f3e0a SHA-256: 7a74b4fa5c19c35c519eddff2005131753c8007296e99b583aed6b353bbcb17d
186 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://kuzutuzo.ru/strik?utm_term=how+to+learn+korean+free+online PDF link annotation
    • https://cdn.sqhk.co/borefigux/jiiijgc/81547704259.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/cinderella_story_with_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/jfjbCjf/13312054031.pdfIn PDF document text
    • http://zifeladawu.scienceontheweb.net/16626522047.pdfIn PDF document text
    • http://torixobo.mypressonline.com/pedimukozegepegoliwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_d2ae08bace0646c8a122227c750d4d85.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_81f474724f7e4fb8a542438df76901ec.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_d8be533d2d2d4c348bc9d2c5a7ba48cb.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_05c44100a342415cbe645d57529dca6d.pdf?index=trueIn PDF document text
    • https://69f7c7ec-f776-4f8b-90c4-e8126cd531e3.filesusr.com/ugd/772020_8b9660d484cf449198f0f8f940af6e0d.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_135b320e699c4e83a3560e55f5e5e9a3.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_a8375e5f60994b878e17feb72631fb37.pdf?index=trueIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_935f0c2129814dd4bdca90378ff15064.pdf?index=trueIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_a1f337f622884039b2b56c94ebecf266.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_c2c00d33acd944528283f13036f94ce2.pdf?index=trueIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_68f2cb4bd39e4d9696b63ba25b46fb00.pdf?index=trueIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_65e677656b8749ef8d324b924a4b2c36.pdf?index=trueIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/wijidevagolifivutajakulot.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 4488 bytes
SHA-256: f942f39fdbed654f6fbdf876abe043310271536b2c629f68376595a0d5a2e11d
font_01_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 10712 bytes
SHA-256: f0d7e704bd48d31b2d600be3e0edfca642269463c4037e2d165a4c251b8ac886
font_02_sfnt_off00012af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 17720 bytes
SHA-256: 4c1bf87e6fabd42c437f1ee097e5c2ac9e1b4e7323377d34b54ed50af7f92644
font_03_sfnt_off000145cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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