Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b39861ddffe7b8f…

MALICIOUS

PDF

66.0 KB Created: 2020-11-13 09:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bb2e7c05053dba6f2737e58676b07d2 SHA-1: 1d28fb2e19a7d54a07a4fdf3364e05cb335be198 SHA-256: 7b39861ddffe7b8fa7d1114c0b59094f0aff85f4245eae74fe0c308664b8557b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. One prominent URL, 'https://trafffe.ru/aws?utm_term=toxicology+report+definition', is directly embedded and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=toxicology+report+definition
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/9b11425379829c5.pdf
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5f90623bcc501.pdf
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/6785499.pdf
    • https://totixibepetuter.weebly.com/uploads/1/3/4/3/134345693/afe5b65b61556.pdf
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f96f90fe7fd9.pdf
    • https://cdn-cms.f-static.net/uploads/4426413/normal_5fad44f2a0a6f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/32543990-da08-4c73-94f2-dbcfe049411f/36315051836.pdf
    • https://uploads.strikinglycdn.com/files/e7f97caf-e44f-4d58-b73b-a0302add3412/rulufe.pdf
    • https://uploads.strikinglycdn.com/files/fb0b5ff7-7e37-4890-9cc1-358325558a45/78742151168.pdf
    • https://uploads.strikinglycdn.com/files/9edec41d-2eff-43f3-b92b-80c885869799/letra_m_mayuscula_y_minuscula_para_c.pdf
    • https://uploads.strikinglycdn.com/files/f039025f-6ed6-4a5a-901b-30d56e641fd7/gamugujigimu.pdf
    • https://uploads.strikinglycdn.com/files/771c80ad-09c0-4611-89c5-9e3d4e6c08a5/wiluliruvetodos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b111.bin
ef4fce6df48d80583025ff0391cd1acf72de2a8a9a099f9486d35f27da3578b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB111 5052 bytes
font_01_sfnt_off0000c266.bin
fc68081f32269f5341950262e8db316e2a9e5101912865d744576beaa8b2b47c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC266 10092 bytes
font_02_sfnt_off0000e52b.bin
d7dbcefd5a9d087f9dbd48d87e5b82950a900fa0f666d4a1f78598b818f3f613		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 16060 bytes

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