Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4dbd7b415eabed…

MALICIOUS

PDF

78.4 KB Created: 2021-05-26 23:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 920fb6738e45c8862257907a3a85f86c SHA-1: 08dc3e4a1c453a6d37f7685e90fc67c72f5e253b SHA-256: 7c4dbd7b415eabed6a1a16f6a357ecc2e830f02116d124e0c14b242941cf12f0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://zajinet.ru/strik?utm_term=lohmann+brown+chickens+for+sale+johannesburg', is suspicious and likely part of the malicious infrastructure. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=lohmann+brown+chickens+for+sale+johannesburg PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485704/normal_60534e208f3c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_601ddee149328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_602c6c1473fb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_600a7c2f5e117.pdfIn PDF document text
    • https://jilarikogezinuv.weebly.com/uploads/1/3/0/9/130969280/5816731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_60417fdf436fe.pdfIn PDF document text
    • https://xeruwuxopexok.weebly.com/uploads/1/3/4/4/134467304/8391997.pdfIn PDF document text
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/4295650.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bf14093-2559-4d21-b787-daf818727500/beats_solo_3_review_soundguys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c75555-8519-499c-871e-afd51ce07aff/gubazukaxaraxeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b19915-417c-4c3a-9887-928a81f3a588/33391206534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64206eb-b774-4a70-8cd1-8ab1a53f4660/32292253718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fde8d08-abf9-48e5-a9fd-403df0f11057/compare_and_contrast_essay_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d16882-8570-4561-8374-4b6e35fbd141/jason__the_argonauts_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d1ec89-fbdb-466f-8f85-fbd29860858d/vizuxivin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad643cf-6fd3-43a1-8e13-9da2275dfa9f/vipulerabik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c02152-7ade-4989-9989-5be671fdce16/canada_front_end_developer_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07612b0c-7448-4f5f-b402-d798a465d6c2/hormone_reset_diet_sara_gottfried_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc1a497-63be-4efd-9a6f-01a063c7b715/nuclear_power_plant_problems.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 5608 bytes
SHA-256: 072a4abef2cfd90cdcb9c76b723f43ef21d35ecbf0133f01dbebfd425b2e3c6d
font_01_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 11560 bytes
SHA-256: 372765cb1f2fc7b3a90cdb6c24cb75f92fe7af88554f9118dc4dd42447969307

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