Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4bb68f8d384722…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 16:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99235e6a5d6bd263d0c44c972c6ddb49 SHA-1: 55ce4d7c39bf018de3c0f574fbb7dede3a8840d6 SHA-256: 1e4bb68f8d38472273e721b663a991ce7e63d31827018bf5418cbe42a88a631a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to potentially malicious content, with one prominent URL being https://infrive.ru/uplcv?utm_term=pic+collage+free+download+for+pc. The PDF structure and embedded links suggest an attempt to redirect users to external sites, aligning with a phishing or malware distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://infrive.ru/uplcv?utm_term=pic+collage+free+download+for+pc
    • http://sobinco.cz/ckfinder/userfiles/files/68471675837.pdf
    • https://spcinternational.in/ckfinder/userfiles/files/97113298649.pdf
    • http://galsabino.it/userfiles/files/lojabawefofamimegezu.pdf
    • http://tzoetemondje.be/uploads/files/jurirosojodorojokawobum.pdf
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210906105801.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/wajejemafiluxono.pdf
    • http://fishngrill.iorderfoods.com/uploads/files/32371254463.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/worasaxavutipaxoxazoroki.pdf
    • https://congtydaihai.com/upload/files/resimutisawaw.pdf
    • https://onlinendttraining.net/files/14473986023.pdf
    • https://fetogram.com/images/upload/files/6216318766.pdf
    • http://www.tomasjelinek.com/img/pub/file/kudamefemelabamagero.pdf
    • https://ofly.om-digitalsolutions.cn/upload/files/zakojuzaresojadox.pdf
    • https://mimpishio1bet.com/contents/files/xuzabajilesesod.pdf
    • https://laznia-radom.pl/userfiles/file/86721315071.pdf
    • http://lonniestireandauto.com/nbloom/fckuploads/file/57239849116.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/84791085708.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/202bdcae76d13769e2cf9b21f5044490/fizifufonevir.pdf
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/66391458214.pdf
    • https://osakaav.com/userfiles/files/94789497690.pdf
    • http://purofirstli.com/userfiles/files/rimezuwuwenenijujedikosew.pdf
    • http://sbcnepal.com/images/file/jereboderumadazo.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bc82e460783b673cee384bc2c86fb0cd/sitajapiliro.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/42488665170.pdf
    • http://noahmission.org/dataroom/file/luredejik.pdf
    • http://www.pvvc.cz/files/59629538901.pdf
    • http://phunphu.com/userfiles/file/11064295912.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_off0000beac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAC 16792 bytes
font_01_sfnt_off0000d6be.bin
06f0387a3f2100a289a7354047388729b10aef979e5426b25dcae6253a9769fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 16020 bytes
font_02_sfnt_off00010022.bin
95209ddd8cd68f30dc608af2e086e1f8512df0c32b968a17828d2e740031fdd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 10616 bytes

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