Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca4f943be470d45…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 01:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3dc87dfa8e63fe51dde081239ed4ff5 SHA-1: 79f77a8ca98f733712e69002aa8881859f23ef7b SHA-256: 6ca4f943be470d45dda224915b93f02811de63338cbe958ec66f037cda5eb25c
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. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning attempt. The presence of external URIs and a link farm indicates an effort to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://gpe-el.pro/ckfinder/userfiles/files/xineg.pdf In PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/2314353111.pdfIn PDF document text
    • https://ekransamara.ru/files/jeturidewuna.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/65886791713.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/28419844040.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/52082538721.pdfIn PDF document text
    • http://seritour.com/rsm/files/zoxajesesebawijoxuke.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/54618482735.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/81900151768.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/dupuvesilisudimubok.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/r9ib0km2gn9vut893rf1s4rjq7/pefazukapesudomiwurewu.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/suxonofunalaja.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/57940422837.pdfIn PDF document text
    • https://pokereshop.cz/data/file/91307767768.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/tabovosuzetamaruduwakupez.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/81891518537.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/28230982192.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/42241382076.pdfIn PDF document text
    • https://signika.pl/Upload/file/vedovumotugu.pdfIn PDF document text
    • http://hongdacable.com/d/files/71580281371.pdfIn PDF document text
    • http://shamayachts.com/upload/file/rarixufavikaxoliw.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210905_392E338C0CD454BE.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/givubozar.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/tovifikito.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9f2dd7d4---97727227548.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210902142230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=khuda+haafiz+watch+online+123moviesPDF 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_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 17204 bytes
SHA-256: 53faaa62165740b2c1f30a70bb342208a3fd9b959863bf9dafdb3a03600ce6ee
font_02_sfnt_off000115b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B3 11288 bytes
SHA-256: e2a849b36606a1f99cc90d4fa63ee3666982f70abc905223ecd51c53178974e9

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