Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed10d346c1d7431…

MALICIOUS

PDF

69.9 KB Created: 2021-09-11 20:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26f74345b68138825d912adcb2494461 SHA-1: 594290669773bef0a928d0b16ddbdd7220a8bfc8 SHA-256: 5ed10d346c1d7431dc184fd5ff26716c3dbe84493118c846dc3ad8677511f7ab
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, many of which point to suspicious PDF files on various domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to obscure the true malicious destination. No scripts were extracted from this sample.

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 http://galettedesrois.hu/userfiles/file/vujifejekas.pdf In PDF document text
    • https://palcev.ru/userfiles/file/zanivo.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/47678259944.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a1d4ba275---doraxolifob.pdfIn PDF document text
    • https://kimcert.net/E/file/nemofopek.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/19807469386.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b2473d370985cc170265df7598cf4d50/80160770734.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/64233322056.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/xamazi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909120124668153.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/60815136893.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/foloranowe.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/kuwajujigekemexe.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/tetunanitob.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/ximizorunegox.pdfIn PDF document text
    • https://ghnservizi.com/file/dejutonoruvirux.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/tewametuzosuwiteke.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/tidofadigikoxixerarav.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/lokirevukumevojituzit.pdfIn PDF document text
    • http://tano-cable.com/d/files/vopupizemuga.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/wadixakefo.pdfIn PDF document text
    • https://teamcode.net/upload/files/63912338825.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/13137991427.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/panaregowebe.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/37061020404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=stickers+maker+premium+apkPDF 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_off0000b484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB484 15108 bytes
SHA-256: ffa7a0e44e421ab0101443d8672274f6caa1e0709d094e7ce9078bf0bb2d4cd2
font_01_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 10532 bytes
SHA-256: d17352255054febae86428bd0f8f1f2a0af50705d366788dab508f64882ea3f9
font_02_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1