Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a45187750d2f3f3…

MALICIOUS

PDF

70.2 KB Created: 2021-02-14 13:06:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6204b27ac58ae7c47f76fec6ce5f7a8e SHA-1: b9781c249f9c9add0e82e4872da073e1de0dd95c SHA-256: 6a45187750d2f3f34b5497d3244b6b5f0812e48e6bde18200843e5b5285a3766
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/aws?utm_term=house+rental+agreement+template+texas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444877/normal_60141fcdcafd6.pdfIn PDF document text
    • https://vukedezesul.weebly.com/uploads/1/3/0/7/130776134/gizomitobi.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/cgc5Qgi/vixasusupegerufiremapaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501998/normal_5ff958954c1dc.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/g5jdBmo/vowiguxanajezefedod.pdfIn PDF document text
    • https://mubujibazakob.weebly.com/uploads/1/3/3/9/133986275/pexutetavix.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/ggfs7hi/city_block_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/ijggdji/20221957490.pdfIn PDF document text
    • https://cdn.sqhk.co/vomoxixeri/O5giVgQ/emergency_contact_template_for_employees.pdfIn PDF document text
    • https://badakawage.weebly.com/uploads/1/3/0/9/130969543/4d611.pdfIn PDF document text
    • https://bovatukal.weebly.com/uploads/1/3/0/7/130739183/6025831.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/p2TigfD/20053319369.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/UHMOAD9/cake_recipe_video_youtube.pdfIn PDF document text
    • https://gunosevibo.weebly.com/uploads/1/3/4/7/134716368/1281912.pdfIn PDF document text
    • https://memabalizova.weebly.com/uploads/1/3/4/4/134490842/bamopidazozo-dajadesopalili.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387931/normal_5fc9672eec776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467915/normal_5fd13b41db811.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477886/normal_600290b7d0d59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 5168 bytes
SHA-256: e55215a96267b065a25698a714441257fc349c621e871e39dce5efebc8b6899c
font_01_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 10736 bytes
SHA-256: afb68f57464b2636aa8b93f418a6e89024dbab87d3ac23f2f514c1853d8773ac

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