Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d6f47dac7ab721…

MALICIOUS

PDF

69.3 KB Created: 2020-11-19 15:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc2ffc15dded3bd8a6d217180a733d86 SHA-1: dd3461aae896f91b9aa4375c98028279607bcf1f SHA-256: 11d6f47dac7ab72155944174995d0ba635ea48c0ddae93e3dcc1023e265911dc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to 'trafffe.ru'. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as a phishing trojan. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=beginner+classical+piano+sheet+music+free
    • https://cdn-cms.f-static.net/uploads/4416304/normal_5f9c4028e8231.pdf
    • https://jipemovikeral.weebly.com/uploads/1/3/4/0/134012889/lijexorigasoneg-silax-vupar.pdf
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5fa203bf74bd5.pdf
    • https://subegudikowezi.weebly.com/uploads/1/3/4/4/134476363/3737974.pdf
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/zunisexufudezo.pdf
    • https://cdn-cms.f-static.net/uploads/4390999/normal_5f91dc1e05426.pdf
    • https://xenolonaloku.weebly.com/uploads/1/3/4/4/134458783/3415460.pdf
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5fa5edbf57745.pdf
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/5650151.pdf
    • https://sozejelef.weebly.com/uploads/1/3/4/6/134600180/1715257.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/78a2b6bc-b0af-4e8f-abd8-aa9c2c4a36a5/27945189663.pdf
    • https://s3.amazonaws.com/badodemebo/bloons_td_battles_apk_mod.pdf
    • https://uploads.strikinglycdn.com/files/7a755ab7-441c-446d-9d68-501ab03b6e8f/royal_oaks_elementary_woodbury_mn_home_page.pdf
    • https://s3.amazonaws.com/gozifep/btc_marksheet_format.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e8.bin
3eb4f3d7cc50f20bf1614196c693303010ca8d672b5a5d9c653c397577f14095
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E8 5480 bytes
font_01_sfnt_off0000e46c.bin
47399c96afe56f48de8ec9ba62495674bd11814e8f8d3a2c6d2ee7b7bd1f6a12
pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 10516 bytes