Malicious PDF — malware analysis report

Static analysis result for SHA-256 97276cc6b44027e9…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 11:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24252370c0f4a27954036f4c3d2b9665 SHA-1: 2886a01e46e13917e5eebb364c23ea38ba5febd6 SHA-256: 97276cc6b44027e92e863202681781d80ae2d4e27ae6a4d48d59e6057ea04608
166 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of an advance-fee scam, using lures related to lotteries, prizes, and parcel delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the presence of numerous external URLs, including one pointing to a potential link farm, suggests the document is designed to redirect users to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://crysiq.ru/uplcv?utm_term=how+to+create+a+group+text+on+android+phone
    • http://hockeydh.com/files/ups/files/munumesiweganitipojupu.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/18029719984.pdf
    • http://telek-trans.hu/editor_up/40587299022.pdf
    • http://saxonrt.hu/img/userfiles/files/36028629539.pdf
    • http://awarelaxcentrum.cz/user_files/file/wujofanutesekazasi.pdf
    • http://photopuzzle.net/userData/board/file/82508192980.pdf
    • https://bosingels.nl/ckfinder/userfiles/files/24445697030.pdf
    • https://sabagdasarov.ru/upload/file/risetufowumetokel.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/14885510695.pdf
    • http://struttur-arch.it/userfiles/files/keterowulefanumo.pdf
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/45371736738.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/bivukuzuwon.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/govutefa.pdf
    • https://phnews.ro/files/file/faterepojupasabevaw.pdf
    • http://kiemdinhcan.com/Images_upload/files/98954988217.pdf
    • https://kawanmto.info/contents/files/juwagojuwanitiki.pdf
    • http://jfhcoaching.com/userfiles/files/nefomalupobulinevixoval.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba52778c4---keben.pdf
    • http://rem-proekt.com/f/file/42633404007.pdf
    • http://scsytech.com/upload/files/xijudowedijiwawadenekoxom.pdf
    • http://joeun-it.com/userData/board/file/rodikedimew.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/98635185429.pdf
    • http://tbm-mova.by/images_from_html_editor/file/fukibaboxuxilinisikajore.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_off0000e84b.bin
d1980916c1f7eb4d14741b79818bd0c601da3296c55bf61a7fbfd7bae285394f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 10860 bytes
font_01_sfnt_off00010122.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 16792 bytes
font_02_sfnt_off00011934.bin
1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 17620 bytes

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