Malicious PDF — malware analysis report

Static analysis result for SHA-256 4806879281c8fe99…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 22:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2936d44a912ae7816d6771735859f844 SHA-1: 5f57cba45a680002ed48fa81c9502d9e6c1b287c SHA-256: 4806879281c8fe99057e6f14d2cbde8c74bc75541c563729c2c846f8fae2e518
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The embedded URLs suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=how+to+backup+mobile+data+before+factory+reset PDF link annotation
    • http://gpkoaee.ru/ckfinder/userfiles/files/sijuvosikojevogipuvagi.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/58839216673.pdfIn PDF document text
    • https://33mobility.net/uploads/files/23900389358.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tokijegameno.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a22f0e6c3---60278344725.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/keratimigo.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/mufaju.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/mobobadub.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/masamenivojilazuwonar.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109081159086611.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/10226008952.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/fokilu.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/jadarikeririja.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/90075220482.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/jegeroxanojikolavosa.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/72695981536.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/sogixu.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/rujatawewuxibamaneli.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/ramunexevarovoromirusile.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4821fc3d---26432901422.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/lefirusixalovudolo.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/70649052207.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/33107824407.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_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 11200 bytes
SHA-256: 9a2a0072234429f9c6cfe12796bf86835fb7258a4b97be8eed98a2917ab425b5
font_01_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 17884 bytes
SHA-256: 6c493703014b267cd7d25e919b3ddd31f8cfae06a1a09740ab00075c27a2fa5a