Malicious PDF — malware analysis report

Static analysis result for SHA-256 7044a26d4960f453…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 20:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c049c925ed1cd84803e3b079a801c0f SHA-1: ce4bb0c70d3d13698817ec277cdae4e06bc2ebcc SHA-256: 7044a26d4960f4532eec98f09ec795232e58b4a79dfce1dd171d608aba3ec4ce
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URIs, many of which point to disposable domains or IP addresses, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=nba+2k20+download+android+free PDF link annotation
    • https://kaowei.tw/image/files/20210904_042043.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/40417588136.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/41257300835.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5b68146a2bd278aad91b857dce64b457/gabet.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe104c2a1---pixekav.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/89669114848.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/ronulipadoze.pdfIn PDF document text
    • http://juha.be/_files/file/52452454099.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613851a090c02---99962377853.pdfPDF link annotation
    • http://nyitotthaz.hu/userfiles/files/69362982945.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/godaxoriwufowizumaruzitef.pdfIn PDF document text
    • http://4rrecycle.com/files/file/98636357583.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/18756079919.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/masusifata.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/11599428339.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/vewedusisosovulij.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/36657729669.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/zimebizuz.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/vopuzetumiwotutod.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/bigegux.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/70574320597.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/58582184358.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210906213150.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/27033956863.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/50463316883.pdfIn PDF document text
    • https://begili.com/uploads/image/files/dibedufiv.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_off0000c121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 17268 bytes
SHA-256: 26837e0eedf96226dfe6834dae99bd65ad63c62d2d4842141844805d23395764
font_02_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 10616 bytes
SHA-256: 93d11b8d79fce19170cc6dfd49b4c774a0b82d7a782d493ec40f1951e0a140fb