Malicious PDF — malware analysis report

Static analysis result for SHA-256 129438d88550f716…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 12:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c47827797e65e62f55c267eacffc038 SHA-1: 05e0eb9c8a4d924b4bbf9dac5f35cc86af0fd885 SHA-256: 129438d88550f7160d346bc731e51f67d5fd3c7cc8f65fb98b8c7d61b7d2a017
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, strongly suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

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://infrive.ru/uplcv?utm_term=instagram%2B%2B+for+android+download PDF link annotation
    • http://perevodvnegiloifond.ru/pict/file/semipu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba4001024---pokodebatesek.pdfIn PDF document text
    • https://ghnservizi.com/file/1137293302.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/pijewanuvesesuliriwozike.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/81894087488.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/5713665783.pdfIn PDF document text
    • http://dmkert.hu/files/file/78681281549.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/nogajuvenodusinokaz.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/topagufobobesibesemu.pdfIn PDF document text
    • http://redactron.com/userfiles/file/52305705893.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/murokasapewafubezafomeg.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/wekivixujazononemeduvi.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/98163131751.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b638120a9386ef9bd0e847213e7846b6/firemegumaraxi.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/6725077582.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/pewupafodifenosim.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/sidegebutasovarenemilupa.pdfIn PDF document text
    • https://aneri12.eu/res/file/pobojizegukaxevutudeg.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/zugebebezupejegedamotiw.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/jilurorapokebidetoka.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/28532997396.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/korazudazumib.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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 16436 bytes
SHA-256: ccf940f955ac8992e404bc015ab1cb3fd2a9576e791cd7bd5eb9cc597938ba10
font_02_sfnt_off00011cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 10604 bytes
SHA-256: b549f0cb8e9bd299771bdb7ceef536b648d0d0d9b70b7e81da3a8e45c620b49c

Open this report in the interactive analyzer, or submit your own file for analysis.