Malicious PDF — malware analysis report

Static analysis result for SHA-256 64414da320fed597…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 11:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c401b77f1d1c80f41f75451515950fa SHA-1: 3290623759669ef78dce0255cf15704c8470cdd2 SHA-256: 64414da320fed5972c305c7f66b4d8b45ebf74770e4eab03c6b78a23b9fa13a8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI heuristic, which are often used for phishing or to download further malicious payloads. The sample's structure and heuristics point towards a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hublihorse.com/uploads/userfiles/files/pemereligodepetazukimagi.pdf In PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/47558647236.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/78556963683.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/tiruwo.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/lobolumekuzujuvejezore.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/e2mq0rg1s7fp74dmc9cb1opo92/66728610538.pdfIn PDF document text
    • http://cmtsport.com/pliki/pevefezavepel.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/21052083450.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/ruwerafanoxaxidesenuv.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/difakifavejumerixu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c70b48b1f---sisemadadusaviluximu.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/faruwojuruxawejorixavudu.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/desijilatosadopigunegejab.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/96609053547.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/82541543538.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/12035141883.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210916_EDA2575F182E3432.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/tajawokedizanapenupeb.pdfIn PDF document text
    • http://fluffy-chins.com/images/file/lirigusavum.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210904065543192430egyjlmsagtt3.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/93385913931.pdfIn PDF document text
    • http://rsentco.com/upload/file/93918551755.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/73271873526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=vidmate+old+download+2018PDF 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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 16932 bytes
SHA-256: 923371b47f9570a55c030d451445c55070bf33e6c329a54cb5d5ffa05d1a071e
font_01_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 10696 bytes
SHA-256: 2627341bce56347afba30887aa77bb2c7ce37d5d64434e2b36878fdd1efb1b44
font_02_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1