Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed28481bef3f977…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 15:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a7bc62776f37e2be928a204ae22f3dc SHA-1: 40bec256c5235cd558509e1e06edc5783da4e657 SHA-256: 7ed28481bef3f97748befb058892193351d11132ad2c3f391540bb880638d34c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by multiple heuristics as malicious, including an ML classifier and ClamAV. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic indicates the document's content is designed to trick users with promises of money or prizes, a common phishing tactic. The presence of numerous external URIs, including one pointing to 'nomylo.ru', suggests the document is intended to redirect users to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=how+to+start+android+phone+without+power+button
    • http://pluimveebeurs.com/userfiles/file/vawebakuk.pdf
    • https://viscom.bg/uploads/wysiwyg/files/66306580324.pdf
    • http://ibshop.gr/uploads/_uploads/files/zikarepaxizur.pdf
    • http://meetburgerusa.com/uploads/files/jevapuzuzag.pdf
    • http://maximaviajes.com/FCKfiles/file/38777360413.pdf
    • http://czpohledavky.cz/userfiles/files/9671146630.pdf
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/nigusufatenagiw.pdf
    • http://yves-segers.be/userfiles/files/lagomufukonibinanup.pdf
    • http://p-energo.ru/content/file/buxutonifexifobenuz.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614510a2206b2---nipuwelalel.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/fewozikejogufevogofulivuw.pdf
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/53997557308.pdf
    • https://isigakizima.net/img/tmp/file/41416878445.pdf
    • https://glycocalyx.nl/userfiles/image/file/nefabame.pdf
    • https://habibitours.com/ckfinder/userfiles/files/80090150957.pdf
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/99625100217.pdf
    • https://vinocastillo.hu/editor_up/tawasavugi.pdf
    • http://dasbluemchen.com/64774766207.pdf
    • https://xn--80ag1a2a.xn--p1ai/files/file/66955905419.pdf
    • http://sarkanyhajo.hu/files/file/72732153598.pdf
    • http://bebaldebaran.eu/userfiles/files/77320558431.pdf
    • https://ubk-sad.de/azubi/userfiles/files/95194676613.pdf
    • http://szyqjsj.com/UploadFile/file/20210912011110622.pdf
    • http://vntattoosupply.net/uploads/image/files/pexowovekutadejofasanux.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_off0000e53d.bin
c0f7fd4895b48556586169c845cb622c69cbbb27742f04748a6268fabae9b600		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 10760 bytes
font_01_sfnt_off0000fdb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 16792 bytes
font_02_sfnt_off000115c7.bin
1e3ac54937460c69a966242cc3c6cb427f010732b4ced3817f408577135bd6f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 17620 bytes

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