Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0b33950ec9443c…

MALICIOUS

PDF

77.4 KB Created: 2021-01-16 05:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 67ae02fde3b5f936a8073a7c8d61d1a8 SHA-1: 5053e560c90373bb37fafab6e895f8862b30a0f0 SHA-256: 4d0b33950ec9443cc5646172b345b9f8c677b1121e5a7a577993fc293e2e8819
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute traffic. One of the embedded URLs, https://traffmen.ru/wb?keyword=upper%20stomach%20pain%20and%20ibs, is identified as a malicious redirector. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/wb?keyword=upper%20stomach%20pain%20and%20ibs In PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/kajasulep_xunujirubibidek.pdfIn PDF document text
    • https://site-1175354.mozfiles.com/files/1175354/sydney_australia_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fdecadc90f17.pdfIn PDF document text
    • https://site-1167927.mozfiles.com/files/1167927/toddler_words_that_begin_with_g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5fa5fe2b2b507.pdfIn PDF document text
    • https://siroxejuvumuku.weebly.com/uploads/1/3/4/6/134657252/famakosajidem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409246/normal_5fe26d520303f.pdfIn PDF document text
    • https://site-1173285.mozfiles.com/files/1173285/58138835293.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/rotizizalipi-xulejowo-wegevok-xutijub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_5f9ce31266e26.pdfIn PDF document text
    • https://site-1166676.mozfiles.com/files/1166676/free_photo_release_consent_form_template.pdfIn PDF document text
    • https://redawisifakaw.weebly.com/uploads/1/3/4/4/134481039/josapetakewatodamixo.pdfIn PDF document text
    • https://julavatevimire.weebly.com/uploads/1/3/4/6/134669339/sisinu-basunivi-fajum.pdfIn PDF document text
    • https://welajewovire.weebly.com/uploads/1/3/3/9/133999455/puxutimul-rumegiru-sovawotezama-jajenadajutud.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 2940 bytes
SHA-256: 5abd1102bbb49cd9fee3e8c7db4f4b96944035d8cd52b1c4794f50b825db5b40
font_01_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 5412 bytes
SHA-256: a518676621a8211e1070f07d49cfecbf6340635d1bc9d63fe96665d7684e8dfa
font_02_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 9912 bytes
SHA-256: c880a1db619c0eac1282eb081301e789e98de2a6bceaa5a48837f0e1ac319883

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