Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbb3f4dabfa9112…

MALICIOUS

PDF

81.5 KB Created: 2021-09-24 09:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57142d329bdc03353acb6af84dc4b424 SHA-1: 1d8ad376f8f3ff920391949b0a230a139644802c SHA-256: acbb3f4dabfa91120fc4a5a56649f06896455cdb1a2b2c32539eb0ba65fae37b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external PDFs hosted on various domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic and ML classification further indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://pickup-ws.com/userfiles/files/40247628746.pdf
    • http://myagreement.com/UserFiles/file/lilefelikugomesado.pdf
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/12789798057.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/25605194939.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/46987451055.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e10460ecc12f31b8ab6ba46daae396f5/21292869880.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/buberomalasafukuxugowos.pdf
    • https://divinenine.net/userfiles/file/35289398981.pdf
    • http://think6.net/ckfinder/userfiles/files/20210918152337.pdf
    • http://gardens-spa.com/user_pict/file/mulof.pdf
    • https://nutstudio.it/userfiles/file/57476349394.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/444a0113198190ccd7130d4ab6c35db4/befigavo.pdf
    • http://snailgame.ru/upload/files/20210901223816.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/31589612851.pdf
    • http://caogenzhiben.com/filespath/files/20210923222905.pdf
    • https://slezanie.eu/userfiles/file/80829807081.pdf
    • https://sanagustin.cl/files/56140578646.pdf
    • https://mygenius.ru/admin/ckfinder/userfiles/files/74121023784.pdf
    • http://portalpr-b2b.es/img/user//file/_0633715001630691189.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/81068524015.pdf
    • https://kristaldicarlo.com/userfiles/file/wadewagag.pdf
    • http://orderkai.com/uploads/files/88923694115.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sky+combat+download
    • 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_off0000d71c.bin
85ce36caa9583bc15e26df79efe802c965e860ed163e1981a56cd322fd9e0183		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 19144 bytes
font_01_sfnt_off00010804.bin
73847b966405feecf40c6ad872a7fe324e457b27fa8f7b6f6c014b7a488774f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 10544 bytes
font_02_sfnt_off00012031.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 16792 bytes

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