Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ef05a236d57dfe…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 09:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c975a23fa94b2636e45e9412368c553d SHA-1: 2886c10151f1557414d0742b675ac1f18617c630 SHA-256: e0ef05a236d57dfea368ede13336d520330915a192a83ff38e1c4327a719e953
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable hosting, indicating a link farm or redirection strategy. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically calls out this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131af2c52045---fepovi.pdf In PDF document text
    • http://wintec-samu.hu/uploads/files/pudivuliwinujenona.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/kefome.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/rirofurotofirefemuwime.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/65944379236.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/061833339331.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-8/20210908085521971286.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/39974496256.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/caa9653814651585670f709e370cf7ad/tejapidubob.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/pokob.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/79682051256.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/31656148442.pdfIn PDF document text
    • http://pneusmarene.it/images/file/lumosesep.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/risukenu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lavesatopijugikajulejizi.pdfIn PDF document text
    • http://rayanchem.com/d/files/73281935758.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/pijusaxurelodepaf.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/21770361090.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210902095226.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109052033073407.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jodifudajidofojog.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210907084804.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/8744834657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gta+5+fan+made+game+download+apkPDF link annotation
    • 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_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 10832 bytes
SHA-256: 077ea7f47b5e39b25123be4170a340d2f2387dd9faac43f078fba4991dc46366
font_02_sfnt_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 18636 bytes
SHA-256: feac707b904b22da876d3d49148e3ffd9741eceaae1253b50cf34187d53ee4a8

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