Malicious PDF — malware analysis report

Static analysis result for SHA-256 456931c1db8ecf1e…

MALICIOUS

PDF

79.2 KB Created: 2021-10-05 15:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8117c0b4b72261c6062fb155857b505f SHA-1: 3fbe4c64cb688e7c16ad54f02543090be80f53f9 SHA-256: 456931c1db8ecf1e48198a0bb562946eb0375c40dff2a85d66d54bbd371a2585
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to domains that appear to be part of a link farm or disposable hosting, indicating a likely phishing or spam distribution scheme. The PDF's structure and the presence of numerous external links suggest it is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=5+letter+words+starting+with+ax
    • https://rubenferro.com/userfiles/file/73704088852.pdf
    • http://tetrafluoro.com/upload/files/nugetuwarel.pdf
    • http://straps.by/ckfinder/userfiles/files/10422626618.pdf
    • https://alkathirilaw.com/userfiles/files/20884963402.pdf
    • http://freetds.net/userfiles/file/nuvozegutixotumugizozuvun.pdf
    • http://phongthuyphatloc.com/luutru/files/gizefi.pdf
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/gufuzile.pdf
    • https://valenciamaids.com/userfiles/files/xudovitoluzirobogomosube.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/25130998258.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/senip.pdf
    • http://conblocmanado.com/pics/file/sanapuwozexenale.pdf
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/23670894066.pdf
    • http://mdknoodles.co/uploads/files/fominotewiwobujibubutawi.pdf
    • http://sutipatika.hu/userfiles/files/81882819883.pdf
    • https://on-call-anatomist.org/ckfinder/userfiles/files/vagarisijefonefebeto.pdf
    • http://sahcarpets.com/userfiles/file/81979395904.pdf
    • http://ymjgolf.com/file_media/file_image/file/18699325010.pdf
    • http://rapabzenec.cz/obrazky/files/18563320176.pdf
    • https://citronel.com/userfiles/files/30068298026.pdf
    • http://grubstreet.ca/ckfinder/userfiles/files/vasonu.pdf
    • https://clickbox.ro/images/file/91276607573.pdf
    • http://gesht.ru/admin/ckfinder/userfiles/files/majul.pdf
    • http://maksimetall.ru/files/90565920622.pdf
    • http://workontext.ru/media/file/livijet.pdf
    • http://mybed.tw/uploads/files/202110010727392013.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce78.bin
ae69c4a0e97c3c099817f80ec6268c2d4c45161681b27fddf6fcd4d5daf2ffc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE78 18516 bytes
font_01_sfnt_off0000fe7e.bin
71f60c60237fcd8ddf80738d7659d7672d29ca9ccc188a4a1e3463faaaa2197d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 10752 bytes
font_02_sfnt_off00011703.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11703 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.