Malicious PDF — malware analysis report

Static analysis result for SHA-256 48894c96d9497124…

MALICIOUS

PDF

71.9 KB Created: 2021-02-26 07:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 50aac0b963717eb0e902ff135493160f SHA-1: 6bf708724ac734bbd6535b1fd738762c696ca6f2 SHA-256: 48894c96d94971248c6e9135b6c5bd59144c13dd194fcc4d6d2565df7c4783af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. While no scripts were extracted, the structure and heuristics suggest the primary purpose is to redirect users to potentially harmful content or facilitate further distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://seumenha.ru/wix?keyword=video+player+hd+pro+1.0.8+apk PDF link annotation
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/43a2bc50ab3.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/how_to_use_tomtom_navigation_system.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/faxukonopimubudip.pdfIn PDF document text
    • https://vobulesije.weebly.com/uploads/1/3/1/8/131857334/sedowopa-lexuwijewov-denozum.pdfIn PDF document text
    • https://xelasukozulete.weebly.com/uploads/1/3/2/6/132681542/973702.pdfIn PDF document text
    • https://pafufido.weebly.com/uploads/1/3/1/4/131407890/puxeriliz.pdfIn PDF document text
    • https://tikuvafijosil.weebly.com/uploads/1/3/4/6/134685963/gemolu.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/Wja1T4V/burolawuvikuman.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/xarodal.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/8571030.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporuki.myartsonline.com/ginil.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/podusubuxumozow.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 5420 bytes
SHA-256: 8e46d1907014af71ab762323c14760f5fe4dc9498491cbc581de4981b3cbd84a
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 10344 bytes
SHA-256: aa514a2ac8edd992e44a9e7faadf2715c569b05b835f677e17ace130ffd0cfa6

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