Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4a20627a87a27f…

MALICIOUS

PDF

64.5 KB Created: 2020-12-19 00:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db1908484a1ce52b214ed96227fd1027 SHA-1: 5cb09a36303cda6e8dcb6c8668deb5225fdf4c2e SHA-256: ce4a20627a87a27f32ea63b0335a4b9d1a6dc4c51cdf95caec94b690255e0a4d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to obscure malicious destinations. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and the ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, contains text related to organizational charts and templates, suggesting a lure to disguise the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/aws?utm_term=free+organizational+chart+template+excel
    • https://foxetevuleludo.weebly.com/uploads/1/3/4/8/134859937/6c8704e9b16c28.pdf
    • https://banavodix.weebly.com/uploads/1/3/4/6/134687022/dudifemarebonimuni.pdf
    • https://difivasopiv.weebly.com/uploads/1/3/4/5/134599246/xumusokobupurotud.pdf
    • https://ketizinuxemuwiw.weebly.com/uploads/1/3/0/9/130969628/558e8db3a7151.pdf
    • https://xajapeni.weebly.com/uploads/1/3/4/3/134341300/9055864.pdf
    • https://lojizeli.weebly.com/uploads/1/3/3/9/133997115/vanove.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc34393405d5340f338f1f3/t/5fcbb804a51c5a1401b06dce/1607186437863/off_road_racing_2020.pdf
    • https://static1.squarespace.com/static/5fc0e800a879396864085b93/t/5fc17f0f173fb5383bdb719c/1606516495894/michael_row_the_boat_ashore_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/20e71cdf-e862-4208-9118-72d81bfcbf10/xiaoli_guo_fsu.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_off0000c397.bin
fc2a892743cda783ce3eca89a8e646985c6cde951f170f725479a497f54fe286		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC397 5244 bytes
font_01_sfnt_off0000d551.bin
289f8da4e53f2ba6773a2357aed3db635ed40e424b2f7862606035ddba86fe6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 9496 bytes

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