Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d87c1ea2cc1e414…

MALICIOUS

PDF

87.5 KB Created: 2021-09-23 21:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 838ffeb59a83cdc327492e1738e6f2b5 SHA-1: 77254e05b678ca40181a614c2ccf0008b686cf99 SHA-256: 9d87c1ea2cc1e414e720cc96216586311f263982851683c25dcd8e73f0a9f920
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high concentration of links pointing to disposable hosting, indicating a link farm or SEO abuse. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious or deceptive content, likely involving a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tiquital.com/documentos/file/tigukugetepadape.pdf
    • http://ldkxzzs.com/images/userfiles/file/tiloj.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16144749ebbf95---71921673961.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/mirorekaxosaxomoxuxas.pdf
    • http://pensionpoint.cz/userfiles/files/41370799478.pdf
    • http://monthclean.com/uploads/files/202109190606076949.pdf
    • http://csc0512.com/userfiles/file/20210903223027_v4nbut.pdf
    • https://atlastoursntravels.com/userfiles/file/patabuzoti.pdf
    • http://studio-orlandini.com/userfiles/files/zakimegapux.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/a3t0hk1pql3aovis8msnmghl7q/15655319969.pdf
    • https://raljob.com/userfiles/file/rewupuvulala.pdf
    • https://computerzone.pk/file/75209974414.pdf
    • http://allamericannursing.com/userfiles/file/xijabegetivetolarivugata.pdf
    • http://bettynblue.com/upload/fck_img/20210912/file/75425236213.pdf
    • https://noithathoaphat11.com/upload/files/latelidulovugatikam.pdf
    • http://norrlandet.se/userfiles/file/begodi.pdf
    • http://nhuaduongnhapkhauaz.com/upload/files/8564317022.pdf
    • http://geopraxis.it/userfiles/files/wazunolulifosis.pdf
    • http://mxagproducts.com/upload/browse/file/xijalekajijenuz.pdf
    • http://liveisagenix.com/ckfinder/userfiles/files/nelapobidurig.pdf
    • http://kientrucphatloc.com/upload/files/misetexexefugivoxudibadod.pdf
    • https://maintogelonline2.bet/contents/files/xugonulomewutozexi.pdf
    • https://www.institutvzdelavani.cz/files/zozipusukerelekulevuge.pdf
    • https://fertilizerproductionprocess.com/d/files/sekemuzuvobagi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+infinite+lunchboxes+in+fallout+shelter
    • 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_off0000ee32.bin
b1904f573ecd10874a19ee0b247004731b6e029b0d92ac6640b1a8f410fb6bd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 18576 bytes
font_01_sfnt_off00011e2e.bin
521d5543dcb5f27c9b8b57c6b17d55a07eec84a460b7741681b305063d5050ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 11036 bytes
font_02_sfnt_off000137dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137DD 16792 bytes

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