Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9aa39b413ae7af…

MALICIOUS

PDF

74.3 KB Created: 2021-09-13 04:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c020765b85bb76d37e7b9af9456bcfce SHA-1: b8b1f8a8aaefca3222671a3df02ffdef5e436af0 SHA-256: 8e9aa39b413ae7afa120a3b3f133206afb104b50af6027ee6e9db1fd9a30d3e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple distinct links, further supporting a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://anpheatingandac.com/nbloom/fckuploads/file/nelazodupefirigugo.pdf
    • http://szcftz.com/upload/korekagiv.pdf
    • http://quocteanviet.com/img-chamthi/files/lolurevufanudurexu.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/polawuveponobesukedun.pdf
    • http://foxgraphics.paulsfashion.in/files/sodor.pdf
    • http://homeopathyhongkong.cn/files/47340883494.pdf
    • http://mtegl.wsystem.sk/userfiles/files/mokowesuwadukug.pdf
    • http://rulife.ru/ckfinder/userfiles/files/dupiraxukatut.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/78848564471.pdf
    • http://fc-junajted.com/upload/datoteke/13838717639.pdf
    • http://litroshaber.net/resimler/files/fukugomekanejirija.pdf
    • https://rubenoferro.com/userfiles/file/91208882907.pdf
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/lekezuvorepubup.pdf
    • http://zaun-produzent.de/userfiles/file/gofog.pdf
    • https://webornate.com/viking1/uploads/files/lovob.pdf
    • https://learningsolution.ca/userfiles/files/78302014968.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/lhdcuahv5hhu7s4qkl2sdp4l1k/35869394081.pdf
    • http://www.deep2001.com/images/library/File/23167600094.pdf
    • http://ppogrimall.com/upload/editor_image/file/56977439318.pdf
    • http://elisa5888.com/shopadmin/upload/files/6367824945.pdf
    • http://giaydantuongphongkhach.net/images/news/file/vafumatugakawapive.pdf
    • http://stylekd.ru/files/55137756438.pdf
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/rabogiraxagedavuped.pdf
    • https://baongochoa.com/upload/file/13424205325.pdf
    • https://viettincapital.vn/upload/files/peliridamifinusokaro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mobdro+safe+to+use
    • 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_off0000c164.bin
a6bc4c6e5d1576c26ac4fa8da988496534e11aac6428688da706086dafa9fa32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC164 10336 bytes
font_01_sfnt_off0000d8e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 16792 bytes
font_02_sfnt_off0000f0f2.bin
10e712cdd607da6c57da1205e75b59ee3e4d4a7186847d7dacd6bab0192278e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 16620 bytes

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