Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8fb00c69c95d88…

MALICIOUS

PDF

72.7 KB Created: 2020-11-11 17:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db53aafec797986b224d94f5728a8d63 SHA-1: b978b3eba281578ef7b3ae1758ba97eaf567824e SHA-256: db8fb00c69c95d8822cd87fab9b1fdb6b7a6965cbb1d066a9bba8e6b36e24135
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://trafffi.ru/strik?utm_term=arcane+trickster+guide, which likely serves as a gateway to further malicious content or phishing pages.

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://trafffi.ru/strik?utm_term=arcane+trickster+guide
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5f8d4ccad3b4b.pdf
    • https://cdn-cms.f-static.net/uploads/4466166/normal_5fa8054354dff.pdf
    • https://gitojigobireko.weebly.com/uploads/1/3/4/5/134517815/c32e9aa541.pdf
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/sawewi.pdf
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/3516881.pdf
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/6332635.pdf
    • https://cdn-cms.f-static.net/uploads/4378406/normal_5fa6478091dcb.pdf
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f887ba489d3d.pdf
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f8780a66971f.pdf
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5faa57d8d628c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5fe1e69f-90fe-4f4b-8871-0ea4965aa711/my_favorite_chaperone.pdf
    • https://uploads.strikinglycdn.com/files/9d2f06d7-ee0c-408f-b26a-d89db536f63e/fudaziwufezusozepipi.pdf
    • https://uploads.strikinglycdn.com/files/2d351b81-7263-4220-b6ee-39b5bf0154c6/54138566477.pdf
    • https://uploads.strikinglycdn.com/files/f16a68dc-7842-41a6-90c2-0f2a83409b5f/gezel.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_off0000e14b.bin
1924ac6c7c9dd0042a58c86ebedbafec407db8769c7f6ee99af0450e6044c35c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 5128 bytes
font_01_sfnt_off0000f2cb.bin
9524dde9dbcc93a1cf7fc583620277f7afb85c4cae9153b5ace33a98f3ea9d22
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 10176 bytes