Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb94323f4c689aae…

MALICIOUS

PDF

76.5 KB Created: 2020-11-13 07:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c0d7741c127ed406b1095dfd5504188f SHA-1: d45576e167a5fc01ea142e5683b4eb0a9a1e3f12 SHA-256: bb94323f4c689aae99cba5bd0ea367ce28f58a58ea1cfcbce0dac6618716a4e8
244 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, including a known malicious redirector. The document body, though heavily obfuscated, contains references to 'Avira antivirus', suggesting a lure to trick users into visiting potentially harmful sites. The presence of multiple external links and the detection by ClamAV as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=avira+antivirus+2017+free++for+pc In PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/wokokagegegaxopefus.pdfIn PDF document text
    • https://loxeramulerizal.weebly.com/uploads/1/3/4/4/134476298/7885507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5f98c4c73ec1e.pdfIn PDF document text
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/piworaxamotela-rukalutitoko.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/putivexo.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/6dcb6975107e71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f8efefbb2663.pdfIn PDF document text
    • https://novafonofijufi.weebly.com/uploads/1/3/4/4/134480525/5486910.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/1234180.pdfIn PDF document text
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/xorabadafawila.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/masegav.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/0d92dab16e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vexeliku/96557651741.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/escudo_do_flamengo_para_dream_league_soccer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0452fa-ebcc-4c99-a023-fc62aed1ec4d/2837829773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/068b9e7b-ff24-41e6-81d2-cb899c2789e3/68225663561.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/rutusogikikudipexub.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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 5432 bytes
SHA-256: ec46d220777f4e102f5d6b1bb7ef80e0fb58175e74640ec948d00dc742441d52
font_01_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 11016 bytes
SHA-256: 5eef03188ccea28bae0433f763d0837496e36918452ca31dfeae378cda7fef83

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