Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35f502dfc1a4c38…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 01:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18f3919d8d64179374bf1ccfc6e11bb4 SHA-1: cbb2cc12729ea5b99fa608406c6fbe94e49f3b87 SHA-256: a35f502dfc1a4c38806242bb95e122f406d5fb2dd18d79c119f0b5de5a02f21f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of a URL related to 'rsa securid software token android download apk' suggests a lure for users seeking specific software, likely leading to malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=rsa+securid+software+token+android+download+apk
    • https://jin-ji.com/upload/files/74042882306.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/95837558307.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613012ff23f3e---notesobekopajibivomalas.pdf
    • https://danielstrehlau.com/userfiles/file/90450452231.pdf
    • http://ky-auto.com/uploadfile/files/16193218386.pdf
    • http://volareinmongolfiera.it/userfiles/files/21595659902.pdf
    • https://bvphcn.bdata.vn/upload/files/95059459781.pdf
    • http://aelma.com/sites/default/userfiles/file/felujezawuvo.pdf
    • http://pinturasoltra.com/images/slider/files/luzoj.pdf
    • http://aldo-ins.com/userfiles/file/memezefaniw.pdf
    • http://roseeskin.com/userfiles/file/20210914121555.pdf
    • https://bisnismedsos.com/userfiles/file/sekasut.pdf
    • http://talleresjpg.es/img/file/golon.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/tuzud.pdf
    • https://vietnam-pump.com/userfiles/file/kivuke.pdf
    • http://gymostrov.eu/gymostrov/userfiles/file/86150309314.pdf
    • http://aqua4you.hu/userfiles/file/pejojoxewekokewubawugupa.pdf
    • http://www.nomorcantikjoss.com/file/4439585718.pdf
    • http://kesherisrael.com/uploadEditor/files/6010256698.pdf
    • http://nelly-design.ru/upload/files/fobag.pdf
    • http://toitureetfacade.fr/data/Files/xusug.pdf
    • http://ganteltechnology.com/system/userfiles/file/94761687231.pdf
    • http://superfasttv.com/uploads/files/65442704270.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b77f89483---nejip.pdf
    • http://jl-vacuum.com/upload/files/93435721910.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_off0000e704.bin
9026ee47714f76c96a9df420f24d42822d4192cbb0f241e279a113e2cccbe543		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 18288 bytes
font_01_sfnt_off000116e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 16792 bytes
font_02_sfnt_off00012ef8.bin
c73d6b8f889b90900806bec4595df03e0d1af91883fa1004b986e69e8c60efab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 10936 bytes

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