Malicious PDF — malware analysis report

Static analysis result for SHA-256 7759335a6c43925f…

MALICIOUS

PDF

74.9 KB Created: 2021-09-12 23:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d13b2086959f4d1b49f15eef520cd60c SHA-1: a4f8ee8edc3d99306b33b2db2cc6611845351b8f SHA-256: 7759335a6c43925f48ec67bacd21057007cfac1fb44e0f296c02daf1184a6e07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The presence of numerous embedded links, including one identified as a link farm on disposable hosting, strongly suggests an attempt to redirect users to malicious sites. Although no scripts were extracted, the PDF structure and embedded links are indicative of a phishing lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5138795e9961f18170a608db56bfe35b/tinigijudojelonotonopagiv.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613302f075aa6---44467059483.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sadagelulabofojarobifoko.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/subexirut.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/pedonozomap.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/67704203460.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/65294670128.pdfIn PDF document text
    • http://baove247.org/upload/files/18117977498.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/91436732200.pdfIn PDF document text
    • http://skncn.com/u/files/vukol.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/23096221764.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/dowenof.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109031032409776.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/disepezogiwokanodopixe.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/16062107710.pdfIn PDF document text
    • https://medius.sk/userfiles/file/rajufaseti.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/81959338796.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/mujupunolofugisi.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/82902050361.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/33024597413.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/gesigujowogolebewuvawij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=escape+the+prison+henry+stickmin+gamePDF 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_off0000c0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 16828 bytes
SHA-256: 9c98a643ec84a5cf357299a4cc6169f4ef0f8cde1943e4397977160bc38482bf
font_02_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 10964 bytes
SHA-256: f532203fbe95a31931b891f6841fcc9fa8a32655d620c4f92aa6bb2dd62af1fb