Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d61e5e4934cbfe…

MALICIOUS

PDF

144.6 KB Created: 2021-03-21 02:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 793a32ae9cd8613a3d27b4256f5fbd30 SHA-1: 70f48d756d59c9055d2a7c4a23955430114f1f66 SHA-256: c6d61e5e4934cbfe22291a28d61a39459d779e5dabffa98ac187182c7d385ff0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity designed to redirect users to potentially harmful sites.

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://zajinet.ru/award?keyword=steps+of+action+research+in+education+pdf
    • https://cdn-cms.f-static.net/uploads/4470836/normal_601e7f45b7f87.pdf
    • http://tijudozi.scienceontheweb.net/riwisinunepivom.pdf
    • https://rokajovata.weebly.com/uploads/1/3/4/3/134376264/wonoluxipuvezo-dukigetuzot-jamedulaf-jevetesig.pdf
    • https://cdn-cms.f-static.net/uploads/4458623/normal_6020618737246.pdf
    • http://vasakuso.sportsontheweb.net/gufajatekopejerovuxowa.pdf
    • https://cdn-cms.f-static.net/uploads/4457318/normal_603734d7212ec.pdf
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/0c0056139281.pdf
    • https://static.s123-cdn-static.com/uploads/4450417/normal_5ff6243fddf64.pdf
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5ff016068ae6e.pdf
    • https://static.s123-cdn-static.com/uploads/4460465/normal_5ffdd214cde54.pdf
    • https://cdn-cms.f-static.net/uploads/4480174/normal_602b0d1383944.pdf
    • https://cdn-cms.f-static.net/uploads/4447464/normal_60211316c1920.pdf
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/vobufixemupofe_dejaz_vugopozivo.pdf
    • https://cdn-cms.f-static.net/uploads/4460686/normal_603613502cfd6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/genedonapubefe/ableton_9._7_manual.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/basic_english_vocabulary_words_with_pictures.pdf
    • https://s3.amazonaws.com/zetubakuz/dewalt_dw744_parts.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f9fc.bin
c1695eeabe43b0f24d645cdbdfb35a5431f457cf45baf441507ccfff116c46db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9FC 5316 bytes
font_01_sfnt_off00020c05.bin
2f23682adc9f590acd6b0574d30e1bd74fdd95eedfb3e5073a19af123c066fe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20C05 12060 bytes

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