Malicious PDF — malware analysis report

Static analysis result for SHA-256 171e810ef8d9d0b5…

MALICIOUS

PDF

74.5 KB Created: 2021-09-09 23:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a69da89a7c69fc1bcf8d3d905e4e6d00 SHA-1: b768b384e04dad84fcad22a14f6f1a831b2c34fc SHA-256: 171e810ef8d9d0b55fc68209fdfde77b646b8daca3983d97a4ab3a4220c2a52c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of JavaScript points to T1059.007, and the overall nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001) and may exploit vulnerabilities for execution (T1203).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hatinhjobs.com/upload/files/42769580935.pdf
    • http://hantechwelding.com/userfiles/file/2021090700264773499.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/95777224984.pdf
    • https://twr1115.net/files/fckeditor/file/41363716087.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/98048764818.pdf
    • http://www.cda.org.hk/ckfinder/userfiles/files/mukamu.pdf
    • http://parentini.it/userfiles/files/7501499714.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/38657673675.pdf
    • http://faurau.com/luodan/images/userfiles/file/42161416521.pdf
    • https://tepatsasaran.com/contents/files/11665433511.pdf
    • http://k-ookuma.com/js/upload/files/gebakabik.pdf
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/lorug.pdf
    • http://mvdeastudio.it/userfiles/files/22312124775.pdf
    • http://medizator.ru/ckfinder/userfiles/files/48971937180.pdf
    • http://upsshop.ru/ckfinder/userfiles/files/bideperaxikag.pdf
    • https://sanipacific.com/attachment/file/82458658485.pdf
    • http://ux-school.ru/files/files/pejukawemevuwizolepapizu.pdf
    • http://sjzhtchem.com/upload/files/10016588603.pdf
    • http://balbu.eu/uploads/news/file/goronemesazojexogumelu.pdf
    • http://qdcmd.com/data/files/85586312270.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7f83d8f01a3cad3fc1156b613ab150d5/darubigekagufesazi.pdf
    • http://domgr11.ru/uploads/files/46544580832.pdf
    • http://color-gateway.com/userfiles/file/25119874911.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/16722063572.pdf
    • https://amartzon.store/wp
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=black+cross+dj+apk
    • 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_off0000bef6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF6 16792 bytes
font_01_sfnt_off0000d70d.bin
627e160cc8df1116006b004025d3f2b98fdf93ce091457bbbeb1f427db51b1a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 10356 bytes
font_02_sfnt_off0000ee9d.bin
9cb525b3eb31d1d21d246612f1325afd1f512db40050e6a2f315ab617956c85b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 18084 bytes

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