Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a74ff8a966c512…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 05:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d00680447f46647502369a3efee783f SHA-1: dbd6437085e58decc096862cb8034fac886ecf43 SHA-256: c7a74ff8a966c512931eb6feb09f89cae00d484ab4d47a1b6326e9a93039e790
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous URLs pointing to disposable hosting. The PDF structure and embedded links suggest it is intended to lure users to malicious sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nomylo.ru/uplcv?utm_term=mod+installer+mod+apk
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2f5apsqoipo0t1kofl9n1k6r7b/96146058734.pdf
    • http://lifeline-sports.com/files/file/73177242954.pdf
    • http://hongphuc.vn/userfiles/file/kexudunaguxoduradifetabu.pdf
    • http://talani.nl/userfiles/image/file/55363510870.pdf
    • http://hycxchina.com/filespath/files/20210906135320.pdf
    • https://chulintemple.house-well.com/CKEdit/upload/files/vogigurizerakomizosujav.pdf
    • http://np-laser.com/upload_fck/file/2021-9-4/20210904184856215108.pdf
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/85284161091.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nutumaxonasedaladavusem.pdf
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/4203358646.pdf
    • http://rdmsrl.it/userfiles/files/55386454453.pdf
    • http://santehnika34.ru/images/file/765322329.pdf
    • https://hatinhjobs.com/upload/files/11724234074.pdf
    • http://rollfactorytogo.com/uploads/files/96813192448.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f9ce15c1b852ee6c6ba30d58028d984d/52120707040.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/27541637741.pdf
    • https://artistaone.co/userfiles/files/kaxowogitubabuza.pdf
    • https://pernambucoimortal.com/imagens/files/wewupumofirosivoj.pdf
    • http://secureyun.cn/uploadfile/file///2021091613544216.pdf
    • http://creaorganization.com/depo/sayfaresim/file/luxewoj.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/bokeravofav.pdf
    • http://imi.vc/upload/files/xexirivixaluperovel.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd00.bin
9a97050c69f1b6b6d340cbe4f59e51450b7ac5e42286a44d1536cb17d8c9e576		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 10640 bytes
font_01_sfnt_off0000f551.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 16792 bytes
font_02_sfnt_off00010d63.bin
36f5114791c3e86b19b5482e2696a23f3e4f1b08a7b2d3ace134365b6da9dd73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 17692 bytes

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