Malicious PDF — malware analysis report

Static analysis result for SHA-256 3923a7cd1f844ca7…

MALICIOUS

PDF

75.5 KB Created: 2020-12-17 06:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0448f09095ff59f714d6a2b323574afb SHA-1: 266947c9a328e4b32d8663ec0ba1d1ca591c116a SHA-256: 3923a7cd1f844ca7d39d8fd5b876377b7849f14fa826a23aac0c627a61b8f2ed
214 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF SEO link farm. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but the presence of numerous external PDF links suggests a phishing or SEO manipulation attempt, likely serving as a lure to download further malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffine.ru/strik?utm_term=sushi+menu+ocean+basket In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f8877e94866c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5fa6b196a1c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_5fd677aeb131f.pdfIn PDF document text
    • https://zigudufojivop.weebly.com/uploads/1/3/4/7/134718002/xurubo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488332/normal_5fce393f4a1d1.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/3902403.pdfIn PDF document text
    • https://kotemuzever.weebly.com/uploads/1/3/4/8/134884044/wogimimelomeni_jiwokusu_kokuzen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5f901b61d6a2c.pdfIn PDF document text
    • https://puvujoda.weebly.com/uploads/1/3/4/3/134326666/30e25b23e2a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5f9669dec69ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5f8e07e3e2cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_5fa6b1a62f0a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_5fbebd1795011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_5fac428a62d97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc0873a11f6a4198483d0f6/t/5fc11cdd18e72e5fdbfef585/1606491358279/science_olympiad_ornithology_notes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5957f084698658e7e225e/t/5fcceb72a87f9f1b19d9bb2b/1607265139640/49719248865.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 2968 bytes
SHA-256: afcae459a23cd8fad60e71fa482ed795063b178ca7a96d5a337757ed3e51a98b
font_01_sfnt_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 5100 bytes
SHA-256: a01ab19a52dad3e6a6caaa49ff0d65ff6f88cb828a08117ddd7705a6de135b0b
font_02_sfnt_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 10464 bytes
SHA-256: ac1add4335e7ad6cee9767d2aee38ccfc94b95c534f5733c59034748c9e44a8e
font_03_sfnt_off00011281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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