Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f4e60de129dd51…

MALICIOUS

PDF

75.9 KB Created: 2021-02-24 01:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b456c9f5685066151d42e1936ab64a42 SHA-1: be96355eaecd1d93422e5d54e27a5dbbb0ce0c5d SHA-256: f9f4e60de129dd51cffccf29e6aa00a669fc7ae41aabda1f8beab70f56f041ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, suggesting a link farm or redirection mechanism. The embedded content, though heavily obfuscated, appears to be part of a lure, likely related to male enhancement products based on the URL keywords.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/wix?keyword=surge+complete+male+enhancement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387243/normal_601556066e074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495409/normal_5fe6cad76e68c.pdfIn PDF document text
    • https://lijokojojet.weebly.com/uploads/1/3/5/3/135333606/tutidawotumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448538/normal_602f83db48155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369514/normal_5fef58d2249bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386330/normal_5ffae818aac69.pdfIn PDF document text
    • https://nosekixiruwem.weebly.com/uploads/1/3/1/3/131380944/558bdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496153/normal_6022dc3c664ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_6032794523062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_5fd63264bef65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369927/normal_5ffc149954be8.pdfIn PDF document text
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/jifogemakos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5fc707521297d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_6011f49f051e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454049/normal_5fdd32e13bc08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473926/normal_60053ebad9e61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_600d547999aeb.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/3027153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386594/normal_5fd61a41bef21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453718/normal_5ff23fa0b23e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5ff9d057c5a32.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 5272 bytes
SHA-256: b90e14d8a05a39e8ba19eaa660c063d6b7368497c655b34b2c86f9f243d40dcb
font_01_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 10164 bytes
SHA-256: 0a70657a8a12bd816b58165aaf354d20929eb19f4eb248f5b797f9e4adf60fbb

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