Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d0889ea163fc4a…

MALICIOUS

PDF

74.9 KB Created: 2021-01-02 16:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 875de1afd84545308dfd794d5a102dc0 SHA-1: e85cff3711d090c740b127813e8d51f570a4c1fc SHA-256: f7d0889ea163fc4a8b2ae4bcebd714eb73ee9903a1797716cc589fbe0bc3cb8c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. The heuristic analysis indicates it functions as a link farm, containing numerous external URLs pointing to other PDF documents. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation, and the presence of many external links suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/123?utm_term=zan%2527s+minimap+1.8.9 PDF link annotation
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/reloj.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/kuvexugumul_rigebis_kudiduwalemume_wumuwegu.pdfIn PDF document text
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/rutexa_biwotipifita_kodoxe_fuwopuxakibub.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/pemeniwubofuna-mimaw-fomovufifije.pdfIn PDF document text
    • https://wuwoxidip.weebly.com/uploads/1/3/4/4/134492879/vugenetigovesu.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/b8204f7b8ca.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/2999869.pdfIn PDF document text
    • https://fagozeku.weebly.com/uploads/1/3/4/5/134506452/jemosibaruzumexawa.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/d66557d1-7544-4b33-a714-c8822c0e0e31/fenolapogozosaluwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/244a38a1-26dc-498c-af21-1575e0ea029c/11991746833.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/sadupogi.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/11024100451.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 5260 bytes
SHA-256: 2788414b55fa3fd9ee4f7085c4853ea372853b2cf2b493cc15369a32f8c5ab44
font_01_sfnt_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 10992 bytes
SHA-256: 8b42a1bc8dd8663913017f7a946f6885bb72fd4acf88b0900694fd27c7f4b32b
font_02_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 16064 bytes
SHA-256: 8ce0575abc6f686af3c1393089841c21814f5c4838d5adbe0d649219e58da802

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