Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fc1bb83da54bf2…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 23:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4b74c9900a4f042e22c3aca37601424 SHA-1: c2fa0f3c23ff8f172b51342e6db9b38e76f9cc36 SHA-256: a7fc1bb83da54bf29b367e5eecf660ff28ee097ec1eb9d5c9329838095b5961d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of multiple embedded PDFs and the overall structure suggest it may be used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9050

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 http://jezirka-biobazeny.cz/UserFiles/File/gofemamo.pdf
    • http://hodori247.com/uploads/files/69437149197.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a64607beb6be8a0be7a00b57d1c0efef/biminip.pdf
    • https://mashtalkandil.com/userfiles/file/84324727202.pdf
    • http://csc-028.com/userfiles/file/20210902152441_03y0pu.pdf
    • http://vce34.ru/attachments/file/zuwujom.pdf
    • http://wernitznigg.at/files/13522645538.pdf
    • https://takipbizde.com/calisma2/files/uploads/zesuxejowolupulokovusuke.pdf
    • http://viettranslators.com/webroot/img/files/lebuzesopuvigozuxiba.pdf
    • http://robbes.nl/media/files/40877283627.pdf
    • https://detmers-kontejner.hr/files/retudetolada.pdf
    • http://bayanairag.com/uploads/userfiles/files/bovozepupe.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/e7c6795ff10de6a79fb6df8f92f0c223/guzejefutazelapa.pdf
    • https://pontus-sd.eu/uploads/file/semubosemox.pdf
    • http://elitk.ru/_files/30282279573.pdf
    • https://champion-osk.pl/userfiles/file/ninewodi.pdf
    • http://h04ydivan.ru/userfiles/file/39943185734.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/67760637756.pdf
    • https://brihat-group.com/assets/userfiles/files/zadexufoliguxugewuxobo.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/zejifiba.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=location+tracking+android+project+report
    • 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_off0000d4a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 16792 bytes
font_01_sfnt_off0000ecbf.bin
d4f31c383fd0d333010915b9a16d0328378e279e390ca01cadb4fe32e03b0f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 10656 bytes
font_02_sfnt_off00010508.bin
e7c603c137fbd9d6d6dff015ee769cd59b526cb87b6f782b47d40f69d3064ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 16848 bytes

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