Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58f390ccd2c18f4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 09:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: baf7de26c7468ac817412d29a2689dbe SHA-1: 516fba4d845cdb4c78ada2962f1c3f2190cb0bd6 SHA-256: d58f390ccd2c18f47d7a1069ff565d40ea205f19b3d1c1277095b8ad85846398
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous links to PDFs hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior, suggesting the document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://theexplorerthai.com/userfiles/files/tabizizotasenarex.pdf In PDF document text
    • http://foto-recepty.sk/images/fotky/volafuvanilakiroginige.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/mumanimabiforupepeval.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/46979489194.pdfIn PDF document text
    • http://retrofotr.cz/files/file/7761987839.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/3271760202.pdfIn PDF document text
    • http://coolscape.info/images/files/zubukejudasosad.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/92581695242.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/tokinijugepusidelibipuro.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/90690352735.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0iqrbj5h0djt0l1npdbc1qqgo7/83315190318.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/dituradefuduloneke.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/vadarufokipixefowunutuw.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/petemoguzowizasef.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/nomubuv.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/tugewozunagepiga.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/pedobenenuz.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/nepuludizosozur.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/sudemamujuwejuvabasoxipuf.pdfIn PDF document text
    • https://preciseenergygroup.com/media/48524894300.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613671b4376bd---vovupenugerakifugelu.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/83494413987.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/vodidebamufajik.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/80593526572.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/46340393543.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/55438298191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+metadata+parent_activityPDF 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_off0000b4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD04 16820 bytes
SHA-256: 65138f0008f4852e9ca09c73cfa0d95d869ded0a734960484b72c4b588f9cb20
font_02_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 10652 bytes
SHA-256: 9754999a351b51243de1db55c51720eedfe791109cf153ed23b684dacc0b902c