Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d2f928335a70f2…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 08:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1979ab22371591d9197b5ccfd4f2937 SHA-1: 01c02571d3f95a329d83319dc2c14d30892c6e19 SHA-256: a5d2f928335a70f24774166425423d9118d80d74872010c914fdd5b3a88a52cf
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 that form a link farm, with one prominent URL suggesting a download for an Android application. The presence of these links and the detection as a phishing trojan indicate a likely attempt to trick users into downloading potentially harmful software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=download+taptap+apk+for+android
    • http://orvosvalaszto.hu/uploads/files/wefogonoju.pdf
    • http://jgweld18.com/UploadFile/file/20210902222355957.pdf
    • http://cy2hand.com/userfiles/1683461519.pdf
    • https://fleuriste79.fr/ckfinder/userfiles/files/83393854774.pdf
    • http://ropesadventure.com/d/files/65551945902.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/derosodirojibij.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c9fd3e6dd5c775f34f494ca20b8e1235/bamesazeze.pdf
    • http://alanaf.ru/userfiles/files/zamaputasawonut.pdf
    • http://confidenzacsapagy.hu/upload/nobinijefimoz.pdf
    • http://0-50.ru/userfiles/file/2779747312.pdf
    • http://bassonconsulting.mc/userfiles/file/54632068387.pdf
    • https://barrier.exma.cl/ckfinder/userfiles/files/boxugomorukiv.pdf
    • http://medicalproduct.hu/images/files/xararagababoxikozulibatol.pdf
    • http://roomyab.ir/basefile/roomyabir/files/dikatepolewotowa.pdf
    • https://drjou-vc.com/upload/files/fimalovifijexu.pdf
    • http://enjoy.sk/editor_uploads/system/files/13026264256.pdf
    • https://alwaysthesame.pt/site/upload/file/borexekemi.pdf
    • http://vatlieulamnha.com/media/ftp/file/70616846702.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/lidazabifoguvugugofusa.pdf
    • http://bajkolandia-leszno.pl/userfiles/file/946458396.pdf
    • https://yellowstonewildlife.com/46221081562.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139938591547---nowexafuzawifutaj.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_off0000d9ee.bin
62cfeae8973500986be5cba89d6b131e65f7aeb8cf34b16d9cba9fd86272fda1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 19044 bytes
font_01_sfnt_off00010ad9.bin
c9f2a35166ca828556de9c22fb25c1a7ea8cf7c3cb8b63e25b0e1c018142517d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 10368 bytes
font_02_sfnt_off00012265.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 16792 bytes

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