Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba8cc5120ad1cfe…

MALICIOUS

PDF

75.8 KB Created: 2021-06-14 19:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0603d3f5ac95f8247f9a0de6ff41fc4b SHA-1: 0057733a3408b1423cf2ab1cf06155e193b83cf2 SHA-256: 1ba8cc5120ad1cfe316451464884ef528910474c5fc6a2c794ee959692a70f6d
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, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDFs, suggesting it is part of a link farm or SEO spam operation. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leading to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/wb?keyword=easy%20crochet%20pattern%20for%20ripple%20afghan
    • https://wabibazo.weebly.com/uploads/1/3/5/2/135295983/pugejiwolidot.pdf
    • https://jiwazakamofefuf.weebly.com/uploads/1/3/4/0/134041011/xatetoruwezo.pdf
    • https://feroredo.weebly.com/uploads/1/3/1/3/131379294/8826934.pdf
    • https://neredijavapud.weebly.com/uploads/1/3/1/4/131409024/b5c015.pdf
    • https://fewugoxozo.weebly.com/uploads/1/3/4/4/134441687/39eafd705c.pdf
    • https://dofuzubakav.weebly.com/uploads/1/3/1/6/131606612/472e5bfc00.pdf
    • https://tuzupenaxu.weebly.com/uploads/1/3/1/4/131454165/vimaxuj.pdf
    • https://nudilosi.weebly.com/uploads/1/3/4/5/134527742/nenepitese.pdf
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/norigiferamat-fiwemiruzax-zeged.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://punumiboxo.pbworks.com/f/72712618414.pdf
    • http://biduzoku.pbworks.com/w/file/fetch/144480720/etapas_del_desarrollo_segun_jean_piaget.pdf
    • http://tolunedinemo.pbworks.com/f/busexobepejomopipuroxu.pdf
    • https://uploads.strikinglycdn.com/files/0a5a8e73-f87f-415a-abe6-bb08ec231acb/dreamwear_nasal_mask_frame_sizing_guide.pdf
    • http://pukagij.pbworks.com/w/file/fetch/144586266/totojewugewadis.pdf
    • https://uploads.strikinglycdn.com/files/99897a6b-9d1f-4ffd-966f-e73ecceb3a3b/lewekifemesugufibofo.pdf
    • http://lijegazoz.pbworks.com/w/file/fetch/144699336/fnaf_4_halloween_edition_free_download.pdf
    • https://uploads.strikinglycdn.com/files/831df1f5-422e-4f20-ae16-f692fc11b117/que_es_agente_autorretenedor_en_colombia.pdf
    • http://zafobagusaz.pbworks.com/f/bineluwapaluteluxetafozo.pdf
    • https://uploads.strikinglycdn.com/files/1936ea94-0ea2-4eef-8c9b-8f9bb14215cc/suncast_hose_reel_cart.pdf
    • https://uploads.strikinglycdn.com/files/84a53a66-422e-4b62-be17-691aac35e68c/22478468055.pdf
    • https://uploads.strikinglycdn.com/files/30a220bc-a2cd-41c6-9503-c501449575bc/91556255646.pdf
    • http://tuxowojopugo.pbworks.com/f/276382685.pdf
    • https://uploads.strikinglycdn.com/files/6f719dcf-0176-4552-91e7-43bb03c18572/titikumagogebuvewer.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_off0000e613.bin
ddcdbc2f2179c91e0c8b030299c1ee602cc564807d7e81f12919b7ce2fd2584f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 5336 bytes
font_01_sfnt_off0000f848.bin
e52ae3e30d7f8f2c926e9ad97f5bfee824a6caa214368f51c10ded57466a0158		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 11560 bytes

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