Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee211d290861fc99…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 19:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb69557a9f617f4d69625d8dad9a321c SHA-1: 867995ae6feb6feda03f7fe778a348aa39738f89 SHA-256: ee211d290861fc994f3589969f819c1a5253c9e05e43714180d40958809c587a
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, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=gta+san+andreas+apk+android+10 PDF link annotation
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/vivulowaw.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/nakepiwokepixuvusu.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/taziforipikefeposuwupex.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/legupuxubemilosifeseget.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142233e05c30---jinovimu.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/35987879063.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-15/20210915170034616742.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/19202626175.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/85996938732.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/dozixenogesup.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/86355085731.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16136a18e302be---18227957477.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/56171975577.pdfIn PDF document text
    • https://reniuved.it/file/xekitixokosabenugenem.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/mokefugifevugar.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/96281134145.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/wutigow.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/33557956748.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/pidobona.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/rewezinurarifewaxefigikol.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/42618617328.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109140258569256.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/tajoxipojitofufapi.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/ladipetupawagotidegadapez.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_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 10644 bytes
SHA-256: d8340ec75a9c6f709984f6e0ec92dbfb3bdc2d5d234eedd8c86f0552546e374e
font_02_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 17732 bytes
SHA-256: 371e7a37bc3afd03753c807c2818bd1c092de430478654ba604a1527d2828141