Malicious PDF — malware analysis report

Static analysis result for SHA-256 020643418640fa85…

MALICIOUS

PDF

78.8 KB Created: 2021-05-08 07:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adfd4a94433589ba8407e90361e1a197 SHA-1: 72b5cc7a45fff79db85e4abcfb1d5e0223f9cf39 SHA-256: 020643418640fa858566c8d6c1c8828dcec6f40e7303811a1433a5adf1b48eb1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO abuse tactic. The primary malicious URL identified is https://leonvi.ru/strik?utm_term=a+primer+in+positive+psychology+peterson+pdf, which likely serves as a lure or redirects to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=a+primer+in+positive+psychology+peterson+pdf
    • https://xejinifinedi.weebly.com/uploads/1/3/5/3/135305438/tasubulinegi-basifelewax-bewesa.pdf
    • https://cdn.sqhk.co/vofonowul/Dgjgi1C/nascar_speedpark_ticket_prices.pdf
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/1690f15430ccdb.pdf
    • https://tojaxufuvubugo.weebly.com/uploads/1/3/4/6/134641466/pugal.pdf
    • https://cdn.sqhk.co/pulafefer/imhHiiv/word_jam_game_free_download.pdf
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/depewa-zamit-kedolobu.pdf
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/ziviwivagaruwod_xefipidim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tutapaxi/dibobiz.pdf
    • http://nibexavu.epizy.com/95385972482.pdf
    • https://s3.amazonaws.com/lekelepowo/play_store_pc.pdf
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_f019d03834f3491fa9a07ff90c507fab.pdf?index=true
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_32d18d62bf7e47f685b1287826a7c521.pdf?index=true
    • https://s3.amazonaws.com/gogoxowiniza/vilolewib.pdf
    • http://goxuvimoludu.epizy.com/ruminotezorerox.pdf
    • https://s3.amazonaws.com/pusori/51410935615.pdf
    • https://s3.amazonaws.com/liluvad/lagu_gratis_stafa_mp4.pdf
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_1cb6b898117d4d33bc88a3e17c57ddeb.pdf?index=true
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_d7688bdc3f424eca95b008201c6f8317.pdf?index=true
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_b6b080bc739b4b2199078855cd2962ef.pdf?index=true
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_69470624801046b7b76ea8b95c32abcf.pdf?index=true
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_512b699eb8b341bc8591d328ca9144f1.pdf?index=true
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_76b87c82cdbc4bb9b103756ebe5658d6.pdf?index=true
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_b1b4af4a60874797bec87a8a3d2580d8.pdf?index=true
    • 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_off0000f4be.bin
fe981a9edb90f1748c7a9a53034626bee82b21416cd389b13b36e4ce0d0f1b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 5512 bytes
font_01_sfnt_off00010769.bin
bc0a63604a92aaddf1e2deccd3491cb6dce4bb5ba9f71797623cfd537d71d10e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 10624 bytes

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