Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b68981a73abf0d5…

MALICIOUS

PDF

84.6 KB Created: 2021-09-22 23:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e41005fdb0b185a5d9e242a71a3617a4 SHA-1: 4f7053107467f4bc8a8fe67afaa00c32dc4db6c8 SHA-256: 8b68981a73abf0d5a6bc585e5bbb3354c8545f452728c183127eeb3192537808
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=serverless+android+app PDF link annotation
    • http://ksnjl.com/userfiles/files/53567583375.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/dejikizafam.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142491194951---tisili.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/86763062338.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/mobekolejowafirefiludokid.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631953268.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/10791439582.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/51791949290.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210905/16307756154621.pdfIn PDF document text
    • https://asken.as/bilder/file/62051098364.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/26929346593.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/deratetabe.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/jiwozenixozawonedukibeb.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/27053470002.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/58025783980.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/vaxixigu.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/jumaxapofaguwovujetexo.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/65199764569.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/pojipubogewuwutoxijum.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/36700815844.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/72094522481.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/moliwatogivepeluzoxa.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_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 10428 bytes
SHA-256: 19832f778e700437aa1908567f2d1c2b63f08d0c1b52a73b27fa71b84904c188
font_01_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173

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