Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bdbc29c874d792…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 09:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e0e533a9a9e58bc0201af5da0efb88a SHA-1: 1561ef044053614b826d98eabe8f36d116356abf SHA-256: b4bdbc29c874d7922fc2f2effac28077341e58cea491f533d83eb32c0af7842c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bharatceramics.in/ckfinder/userfiles/files/kijebupenabaluwi.pdf
    • http://gocoachfox.com/userfiles/file/68491626266.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c340e9bfa96c51867b380b61ed8cb884/dodojusufuserugipolidulo.pdf
    • http://faisaltowel.com/survey/userfiles/files/jomogamomirumevo.pdf
    • https://0900107678.com/upload/file/782585313.pdf
    • http://dichvuhieuchuan.com/upload/files/dezafovolezivez.pdf
    • https://marbletreasures.com/uploads/image/files/27699113984.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/94866786642.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b9aecef77---80723658080.pdf
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/87967193256.pdf
    • https://adasms.fr/userfiles/file/62216958083.pdf
    • http://tcyy88.com/userfiles/file/2021091621560273499.pdf
    • http://atenngo.com/admin/sites/site/documents/95265002841.pdf
    • https://hotelmitrutarija.com/uploaded/files/mugedufa.pdf
    • https://serka.com/serka/upload/files/63295464385.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///25832277819.pdf
    • http://kwong-cheong.com/userfiles/83502154579.pdf
    • http://clinton.abwingsmd.com/uploads/files/81034776394.pdf
    • http://bangtutrang.com/upload/files/20749654728.pdf
    • http://101eyewear.com/luutru/files/wexelulejeduxegagi.pdf
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/lizimebudumebebomof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=harvest+moon+bahasa+indonesia+ps1
    • 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_off0000c719.bin
aa5c2f46a6e16a7b9db17218b05d6d4d3449c9b68b9b69cec8a50cdc2e98ac4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 10860 bytes
font_01_sfnt_off0000dfc2.bin
ca999d569e257fb8e75ee39fa3fbda95a785f6ce28e9ccc26184f717eea87e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 17212 bytes
font_02_sfnt_off00010cfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 16792 bytes

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