Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93bafef05e9f879…

MALICIOUS

PDF

74.1 KB Created: 2021-09-27 06:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7dd64a18d14959cf4343f673f13205c SHA-1: 04767dc64edd8b933265849e7b1149490229c0ab SHA-256: b93bafef05e9f879f9c5ad1e5817ac2b971c7b17cb589e4a07b63d074feac907
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 disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent, likely serving as a lure for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=uri+the+surgical+strike+download
    • http://zjgyuanhong.com/v15/Upload/file/202195122843430.pdf
    • http://chelseafoodmart.com/uploads/files/29930373437.pdf
    • https://zhbiotech.com/CKEdit/upload/files/kokibawabozab.pdf
    • http://mrpokedb.com/uploads/files/vobeke.pdf
    • https://nangluongvada.com/uploads/files/bagilozosukirabugejezi.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/736744888.pdf
    • https://eldorado777.ro/upload/editor/file/93946965720.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/15494696831.pdf
    • https://ever-progress.com/upload/files/9168224480.pdf
    • https://serwisnawigacji.pl/userfiles/file/6755253013.pdf
    • http://rjbmachinery.com/d/files/76714973376.pdf
    • http://naturallabs.de/userfiles/file/fuzedemopo.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/20305261379.pdf
    • http://ladyvenus.it/userfiles/files/vofefusujibisodagubu.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/89396901253.pdf
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/2659163357.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409310864c2---1526502014.pdf
    • http://zjgyuanhong.com/v15/Upload/file/2021922128128104.pdf
    • http://geofer.eu/userfiles/files/1128695953.pdf
    • https://italvaping.com/file/14360470691.pdf
    • http://tokstar.com/_UploadFile/Images/file/fusunefobujaserojavaxo.pdf
    • https://shiksha24.com/userfiles/files/dabimunaz.pdf
    • http://erainbowrealty.com/userfiles/file/kavovaxede.pdf
    • http://tuanlongland.com/upload/files/jagevonosiresimow.pdf
    • http://www.slenderclub.cz/ckfinder/userfiles/files/kudomatofazobifo.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_off0000b6bd.bin
039c147e6c77416f8170c3ff7a8f34fe711b0bf3732c4cf0439817d99075bca1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BD 19512 bytes
font_01_sfnt_off0000e98c.bin
e311d4ec32de8a53f3c50a9dea58fe100011775334b9b937a1ffa854dbd110d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 10932 bytes
font_02_sfnt_off000102b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 16792 bytes