Malicious PDF — malware analysis report

Static analysis result for SHA-256 13704155d0b2ef3d…

MALICIOUS

PDF

85.3 KB Created: 2021-04-20 21:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdba0a291f81891fcf3d660068a14e87 SHA-1: d2aca643dc25686580b0c18e871d29ed5173a6bf SHA-256: 13704155d0b2ef3d6fb30b921cfb949b34a578a281ae2460fe072ab715766117
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/strik?utm_term=how+to+install+handle+on+ge+spacemaker+microwave
    • https://cdn.sqhk.co/xugosovemi/Czgc7hi/12374191118.pdf
    • https://cdn-cms.f-static.net/uploads/4485705/normal_5fd0f598d86fa.pdf
    • http://wozupabalaviv.medianewsonline.com/kezogolaj.pdf
    • https://cdn-cms.f-static.net/uploads/4460686/normal_6037069dac4ca.pdf
    • https://cdn.sqhk.co/zapuduve/iejhkaR/template_daftar_riwayat_hidup_gratis.pdf
    • https://cdn.sqhk.co/sigidezok/djjWjbk/equalizer_bass_booster_pro_free_download.pdf
    • https://cdn.sqhk.co/fubafonu/TghjWjd/move_to_ios_android_app_not_working.pdf
    • https://cdn.sqhk.co/balaragu/ifdXigE/56174974202.pdf
    • https://cdn-cms.f-static.net/uploads/4379048/normal_600dd0cfe4186.pdf
    • https://cdn.sqhk.co/bujerinalo/fjitlsl/biserinawemerovu.pdf
    • https://cdn.sqhk.co/kolusugego/iaGkhie/zombie_escape_room_hints_cheats.pdf
    • https://cdn.sqhk.co/lakanodip/jiguhgY/bubble_shooter_mouse_blast.pdf
    • https://cdn-cms.f-static.net/uploads/4384036/normal_60430efd3bb27.pdf
    • https://cdn-cms.f-static.net/uploads/4406455/normal_605ef80641888.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_654b818dd43044599ff06b121c71d0c8.pdf?index=true
    • http://jelenaw.myartsonline.com/64859607757.pdf
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_2c7b9b9dd70e43ed85324dc85e3af051.pdf?index=true
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_f81697a0bec046abaf2a4d743e4ea9ed.pdf?index=true
    • http://sogivuwe.onlinewebshop.net/satyanarayana_biochemistry_latest_edition_download.pdf
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_8967147b0c994783a162d6627f3154d1.pdf?index=true
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_9ee0e7c29336448facce6973d365eeed.pdf?index=true
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_f447d8115a874e0a91fa356540cac259.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100df.bin
4a83c474a01d83850c7f24bd837156d5f7f01c53c0464cc7183bffcfa4537de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 5452 bytes
font_01_sfnt_off00011347.bin
5fb4cc58d5e7d6df7e397442dcc6108c4fd8a12916ce467f81b34020eccd1c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 11196 bytes
font_02_sfnt_off00013961.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13961 4324 bytes

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