Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a83507f114df6a0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 14:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bd348b1a3d556e6ad9f47ab1be412a2 SHA-1: 6b2e4fac53980c49df628b3854c683ba9162e82e SHA-256: 2a83507f114df6a0c61a698b9f5b2cfb4488efd12c61742d99c35622cff3f6c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=how+to+download+minecraft+pocket+edition+on+laptop PDF link annotation
    • http://ekstelekom.com/userfiles/file/44635069253.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/reral.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/vasefovenuganezoregilur.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/23669739805.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d67d28ce88199ae32139eaaa86a76b55/53762679067.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/90229261055.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/sogifokonokumurovovov.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/besekakarel.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/jusexiwul.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/figaravukona.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/16592817528.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/zudopivajot.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/sulebila.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/69922915228.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/65076793416.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/28162829422.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/binut.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/9231820875.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/rugaruzipugoduw.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/lobifusedasinebitiwi.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/xaxixibaw.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/59359471730.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 18036 bytes
SHA-256: eb3df4cfee0a37132ea92afb426512fcf7d472b2a015730cab3dc683a63b692b
font_01_sfnt_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 10784 bytes
SHA-256: 27b638025d6ee4b6b3f1a020be899ae51ab4bb7499a873e53b324b463153f640

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