Malicious PDF — malware analysis report

Static analysis result for SHA-256 310f186577ae1177…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 10:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9f7499503527385cfdc354cdc7b74b09 SHA-1: 605761183e556e3d6aadaba9b9c4f0508269c7d7 SHA-256: 310f186577ae11776e21adccb22d9e9f206140f734b5810b85387b31f6b12661
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan implies an intent to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://texinpack.com/uploadfile/file///2021090420525898.pdf In PDF document text
    • https://eternalbliss.net/file/34338732986.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/59385891315.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/1276624827.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/74146951295.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/pijoger.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/3734154046.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/beguzafilakonevofopogagun.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/49888596871.pdfIn PDF document text
    • http://chinalabware.es/d/files/32487537693.pdfIn PDF document text
    • https://cap2013.aseat.fr/userfiles/file/gikel.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/zibedex.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/wukesibarifinonemibedip.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/10473482506.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/99290321646.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/81322221902.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161432696a7a97---55902219814.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/zekixewopalizutojefege.pdfIn PDF document text
    • https://partetesal.ir/data/file/jokiduderukomatunupeja.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/15776689035.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/kipebofejoru.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/q10ld98dagq31o3klvq25bsiqv/kuvodaxuzoreb.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/kexavivakalu.pdfIn PDF document text
    • http://poultech.net/d/files/vuzavetukojinarepagixov.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/lagelugidofitoj.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/wigifakupugifujad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=actors+in+die+hard+2PDF 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_off0000b413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB413 10520 bytes
SHA-256: e2e6f386b3e916b6cfd10ae04217373425c237e0cd3274bdd0b0ebf458471e39
font_01_sfnt_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 15828 bytes
SHA-256: 9d9749dc21d6cdb408638447e6314b914c349802ac7c8519f56f6eb6d0d48cc9
font_02_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1