Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c556d7735dd5d2…

MALICIOUS

PDF

101.8 KB Created: 2021-03-18 02:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb921a37a44de0a38faad47de037a1af SHA-1: d83beccdd45533d44350aa7f2147e2352aa672ab SHA-256: c8c556d7735dd5d20b47091b738e1d5b002063bb3390d39a58e69e8cbc1200b3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of numerous URLs indicate an attempt to direct users to potentially malicious external sites, possibly for phishing or malware distribution.

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-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://vilenefex.ru/wix?keyword=pixel+car+racer+mod+apk+happymod
    • https://cdn.sqhk.co/nanijamu/dhjNick/makenopetasoserowodolati.pdf
    • https://vezinamitin.weebly.com/uploads/1/3/5/9/135984824/mejuxofigo.pdf
    • https://cdn.sqhk.co/begesiki/csphf2b/ctet_answer_key_paper_2_2018.pdf
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/281a0e2a2.pdf
    • https://cdn.sqhk.co/xubipoxeguza/yicCCgc/duwurivejinu.pdf
    • https://cdn.sqhk.co/sitopizol/7ighaic/jogijojotuzanigojiw.pdf
    • http://idealicaitalia-ufficiale.site/4153518057589137.pdf
    • http://xifelaseb.22web.org/business_model_canvas_theory.pdf
    • https://cdn.sqhk.co/takularozo/ahbijjh/today_s_date_in_numbers_format.pdf
    • https://cdn.sqhk.co/bopesajan/kdyJ7QS/black_caterpillar_guide.pdf
    • https://venofizemebesok.weebly.com/uploads/1/3/2/6/132681219/b984664e.pdf
    • http://organize.shop/7766197181244ria.pdf
    • https://static.s123-cdn-static.com/uploads/4486354/normal_6006949284037.pdf
    • https://static.s123-cdn-static.com/uploads/4365619/normal_5fdf14d8869ab.pdf
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5fe6b76eafbf9.pdf
    • https://cdn-cms.f-static.net/uploads/4391636/normal_6019f22e6752f.pdf
    • http://gemitufelog.22web.org/bobodutigujo.pdf
    • https://zurukonovode.weebly.com/uploads/1/3/1/3/131379219/xozaluk.pdf
    • http://zokixofevuku.22web.org/ada_or_ardor_quotes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lipepojofutuxuf.epizy.com/rifuvolenabazonawujad.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011374.bin
f45290ee2dc16eb3e597f36cacc3e0297a393010060eac159477d8be42b0122b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 4972 bytes
font_01_sfnt_off00012453.bin
088ef805adad98a10eeb911cb8aa9fd8319fe6c95b74c3e2ee824b3c519e4b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 16280 bytes
font_02_sfnt_off000153f7.bin
d38acf48e78da5f824ece3622bf99e138af40a40f1e33fba9b0e0861abfa3471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153F7 22236 bytes
font_03_sfnt_off00017b88.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B88 4324 bytes

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