Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbeeeed3ffbed06…

MALICIOUS

PDF

61.1 KB Created: 2020-12-20 11:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b3840cc463534eb410905e7c068a3a16 SHA-1: 2dd3f0de882ca7cc4b8aa5aba98e9d48cc50ab53 SHA-256: 5fbeeeed3ffbed069a62a385d7b4e6188cc62ae4525fb07c3b4457f6cbf9ae21
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, but the presence of numerous external links points to a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/strik?utm_term=cobra+8000+pro+hd+gps+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f9ebb2c0778b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5fd6ee656005e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423145/normal_5fce2374898e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f8961d3693ad.pdfIn PDF document text
    • https://nupureforisuro.weebly.com/uploads/1/3/4/3/134353583/328022a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457854/normal_5faabe74c4805.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/cc4ce4fd64a789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5faf39d09addb.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/diwitapezu/97980793581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7af279-1c47-4723-ac90-5127f3fb59ae/adobe_cc_2019_zer0cod3_patcher_win.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f9cf23-271e-4d89-ac78-5befced2a540/23352618564.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/falulitezejekivofadevone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72cdefc6-9705-48fe-b434-275238599118/16_team_bracket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae603b89-7fc3-4b78-ad39-ec1f21bee599/bupab.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/66690785767.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_off0000b157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB157 5752 bytes
SHA-256: a758fe7c407f209e408809fd3c9c8a22b9b9837b1c498eec34ecd6e6dfc35fad
font_01_sfnt_off0000c4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AA 10164 bytes
SHA-256: 81a9cec885e914f1a4b8a35c7b67fe7f5e42c65dea56df81119f158f56cd094d

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