Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d20d56cadce070…

MALICIOUS

PDF

74.2 KB Created: 2021-09-24 12:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 39bc7b640d13fcad5788859676c018b4 SHA-1: 830b95cad149a5779b60b40c7b6cdec5bc7caadb SHA-256: 80d20d56cadce0706ba64d0fbcca0386fb9ee3cc0923369dd446b1d14a558e3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which are flagged as disposable or potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://pixomot.ru/uplcv?utm_term=sistema+ios+apk PDF link annotation
    • http://hotelrealerimini.it/userfiles/files/jipakowuganejixusovika.pdfIn PDF document text
    • https://limadelimon.com/images/file/32675706128.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/71270447026.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/30711678486.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/74541053840.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/85018445996.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/94579793118.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/fugupo.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/70378591536.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368084b5d21---pekexabulemokin.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/pageguwija.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/42865419720.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/22372212604.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/xarutuvit.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/fuvebuwun.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/91592419419.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/duwerolezakog.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a3ab7ded158b6a760e0181c3767a8052/45557391878.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/fiduzeranamirabobonofidid.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/67462530596.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/sidazipim.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/51662655463.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/58042340634.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/42695131190.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210918181633.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/nevidenoran.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_off0000c023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC023 16760 bytes
SHA-256: 3b840f8bc8cad10d6a9428d83da9a84177bea203867d7231eaa0bd39d01289c4
font_01_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 10332 bytes
SHA-256: 24d38583757da69d477c67ed32b325c8f010fe975cd4424820135ab9e1105f87