Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b3a4fcbc9e7922…

MALICIOUS

PDF

109.5 KB Created: 2021-01-12 01:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5c29759291bf03f96a807dc685c3c912 SHA-1: 77389571fee9b822e9c5069fa9e681df30aa2022 SHA-256: 43b3a4fcbc9e7922527907c7dff05ce00a05c8adb68eee2b672a20043d0c7834
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gettraff.ru/123?utm_term=fulton+county+calendar+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_5f968cc59c3e1.pdfIn PDF document text
    • https://gukapubukon.weebly.com/uploads/1/3/4/1/134108909/4262149.pdfIn PDF document text
    • https://xidoferowugefu.weebly.com/uploads/1/3/4/3/134348033/segifimazatol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_5f9fc7a31b2ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5fc8fc4987bcc.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/kojufowudiv_vuzixapu_rugexak_litiliwalilo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fe056b45400a.pdfIn PDF document text
    • https://pajopujo.weebly.com/uploads/1/3/4/3/134305169/dobazezevulegob-wutimanupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_5fc1e2c77f7e9.pdfIn PDF document text
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/gekudax.pdfIn PDF document text
    • https://ludojuvixodezo.weebly.com/uploads/1/3/1/8/131856813/1061fd6f96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5f990beba2d3a.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/jitimesolagun/e_network_speed.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/kewobejawovapazavupar.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 18800 bytes
SHA-256: 1bcb134df93e349c400fd312e674db07521c47e4184989f60a83cbcbfc06376e
font_01_sfnt_off000156f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F2 5088 bytes
SHA-256: d09a2c3c14732866ee500f9c5a383bfa6115effcf7166d608402e133341285e7
font_02_sfnt_off00016857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16857 12900 bytes
SHA-256: 832f6d43a265c9fc96abd06ed46649e9e89cbbeb3ebc0925db1a703598369deb
font_03_sfnt_off000192d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192D2 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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