Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9847d36888dccd…

MALICIOUS

PDF

94.4 KB Created: 2021-10-05 21:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0086ba832c378f52af98440177957cf8 SHA-1: 64caecd1f213668d7c262284049bd710c1857b1c SHA-256: 2a9847d36888dccde6c945aa5a6fbc2c57d0f62cac433ab992ff28a8e616346c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript points to an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 https://garglob.ru/uplcv?utm_term=the+yellow+finch PDF link annotation
    • http://montesantangelo.it/files/files/40032406417.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/xuxazud.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/45871599597.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/41082500861.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/71986738165.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/26309984719.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/mafuridotema.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/91600428313.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210831230522-67564477093.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/rojodezejafu.pdfIn PDF document text
    • http://krupongs.com/images/file/96833250495.pdfIn PDF document text
    • http://yibetter.com/data/files/79586765866.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xezolokefimox.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/cddecefcfcf08037fc079cabf12f324d/wixumaden.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/25198990919.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/nonoxukakapif.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/qk0lmv4ppsmkvmrbmnmvli8bp3/55276601875.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/10933316890.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/88430637256.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20211002213708_ljphi0.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/vureta.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/wobavugavipusefigir.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/18595265035.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/livesejowoxozewewav.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_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4D 10068 bytes
SHA-256: a0d2e7829ff9b9bbd0ebd6d392847c447bfde3f226a2df9ab68c91fecdd0224d
font_02_sfnt_off000130aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 23148 bytes
SHA-256: 0b3006e97127772c60bb4a3246b9e963368d88586a7d00f7d78f37937011edff