Malicious PDF — malware analysis report

Static analysis result for SHA-256 88da462d98a944f8…

MALICIOUS

PDF

69.0 KB Created: 2021-04-07 02:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb7aa2e235563cc384e6f848bfe629bf SHA-1: 1e932280c1831376ef779644b82f4c3bc7f0c99a SHA-256: 88da462d98a944f86387eb200430905978bc43c1df2bc25560498f2d36a3439c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a mass of external links, likely to SEO spam or phishing sites, with one prominent URL being https://mezovuduw.ru/award?keyword=patwa+dictionary+free+download+pdf. The presence of numerous Weebly and S3-hosted PDFs suggests a link farm or distribution network designed to obscure the true malicious intent. No scripts were extracted, but the overall structure points to a malicious document delivery mechanism.

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://mezovuduw.ru/award?keyword=patwa+dictionary+free+download+pdf
    • https://rivibesosad.weebly.com/uploads/1/3/4/5/134529272/misivomaz.pdf
    • https://cdn.sqhk.co/kojanakif/gjpfSgj/18004667131.pdf
    • https://sutapupimode.weebly.com/uploads/1/3/4/6/134615637/tuxetazajefos.pdf
    • https://reseviris.weebly.com/uploads/1/3/5/4/135400779/db8157252bddc11.pdf
    • https://cdn.sqhk.co/milasutepi/v1VHifx/97218471501.pdf
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/8049466.pdf
    • http://giwapozolaleg.mypressonline.com/peavey_classic_50_50_power_amp_for_sale.pdf
    • https://cdn.sqhk.co/wazilisiko/eAJ1YoP/42963040879.pdf
    • http://losopefopamusoz.sportsontheweb.net/kezibaw.pdf
    • http://tofoxewesaxizuz.mywebcommunity.org/tratamento_anemia_ferropriva_pediatria.pdf
    • https://cdn.sqhk.co/novupezezis/ejjhe17/andaman_tour_guide.pdf
    • https://cdn.sqhk.co/jivonaxadu/ChiEii7/69593082226.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sepovutapakogaf/html5_address_book_template.pdf
    • https://s3.amazonaws.com/jixeremipet/who_were_the_celts.pdf
    • https://s3.amazonaws.com/kewakuko/benanama.pdf
    • https://uploads.strikinglycdn.com/files/4ce521e7-c81f-4786-96b4-2851bc0354cc/tp_link_wr841n_change_admin_password.pdf
    • http://donufuruwitij.atwebpages.com/46332034894.pdf
    • https://uploads.strikinglycdn.com/files/cfdfb92a-9072-4eb6-bb76-10a20b2b1c44/tevegigixabatokewosejir.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_off0000d1d7.bin
ebcd67991afdd087e21f3db0cb87a6adc16fb5eaf3d05d27766d2b85c0c760c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D7 5164 bytes
font_01_sfnt_off0000e395.bin
16796f0e8f1de5ef6aa18262bfa8b469a9d51c210d3c742369417fafe59d5499		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 10228 bytes

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