Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3efa69268ba4a9…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 11:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 707ed1fc8f5ef7e7326ad6134c72fe44 SHA-1: 14fad8a1d68fc23c74f4f776d1f3df437d186061 SHA-256: ee3efa69268ba4a9d46669f5a0cf181d135460a3b2f2a7b949d515854a44aff3
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. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, one of which is a PDF file itself. The embedded URLs and the overall structure suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=how+do+i+block+text+messages+on+my+android PDF link annotation
    • https://olboihorgaszto.hu/editor_up2/98026586653.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210918014801.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fiderakafenigakekar.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319027912e3---jarorofofuranapumazoxalid.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/nunebujanawimitatad.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/bonumigilixofoluju.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/31578353610.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/30728219143.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/70709665214.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/timukuxux.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/54910802920.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/jisurisav.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/fevevu.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/zanapevepuralotorizob.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/giborofevolofazoro.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/36016501787.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338da843c7c---32014372953.pdfIn PDF document text
    • https://ccskin.com/geektic/files/defiro.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/14945006667.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/refapupoz.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/fezenababitupufipik.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/paladav.pdfIn PDF document text
    • http://bckvalumni.org/userfiles/file/zavisoduzafetenikog.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_off0000b071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC883 15328 bytes
SHA-256: 1ca255b7ab39cdce84e635ff888d6e9597b5a3af90d859520ac3bb7c64bb151f
font_02_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 11236 bytes
SHA-256: b226d87181a0a081d54752da8e9d313fa15e3ed0509d41079c777b48f0337da2

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