Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bf5e1725baeba5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 18:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac0698fdec16d19222fb61698b5dea4e SHA-1: af3e4562db4b9d87c33c980bf3f6a9b96508eb31 SHA-256: 83bf5e1725baeba517262ef56ceacc0668ab98501741b3661b0626627cb37639
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, including one identified as a link farm on disposable hosting, strongly suggests an attempt to direct the user to malicious content. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://abwcoliseum.com/uploads/files/lofujonawopux.pdf In PDF document text
    • http://sissonne.hu/editor_up/92801270045.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/sopafiridodenabapipivubiz.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/musawojonipuwimif.pdfIn PDF document text
    • http://turnyras.lt/Files/file/49032400639.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcde6553c9---sabulasig.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/82531213097.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/mivedo.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/rebidejipogesiku.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/xomikizaxazekizewewiwak.pdfIn PDF document text
    • http://temple.mo/userfiles/file/xajolokifuvoxuwisemajemax.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zegawe.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/kukun.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/34297682752.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/17585792399.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/34138810245.pdfIn PDF document text
    • https://ghnservizi.com/file/60485228416.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/fazuw.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/vukatopetada.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/56014817657.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/togogurunesazadimopunaju.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329133cfb43---90509948704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=karbon+monoksida+adalah+pdfPDF 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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 16032 bytes
SHA-256: ad7af082054bf1133a1dca161c26a281c380cadba2538cc785b56fe6fdf34905
font_01_sfnt_off00010990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 10756 bytes
SHA-256: d28e88495dc8824b43238c277c1bc911e5dc6d26912cefa120cc1b7ddf5feb0d

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