Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ecb4c2fccbfec57…

MALICIOUS

PDF

76.7 KB Created: 2021-03-03 12:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c532ed32311a5c65e6b06f908640400 SHA-1: 76445fec2d7f3e47d96ba27a082c1e636b75ef37 SHA-256: 2ecb4c2fccbfec57ba1ca837f0bba18f726bbe4cc9c8a2bd26ece8b228eaa002
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to other PDFs hosted on various domains, many of which appear to be disposable or associated with link farms. This behavior is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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.
  • 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://jumiwimov.ru/123?utm_term=monitoreo+redes+sociales
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/2122471.pdf
    • http://4escam-bot.online/china_visa_application_malaysia_formycper.pdf
    • https://wabelurotetef.weebly.com/uploads/1/3/4/6/134693048/1655078.pdf
    • http://xamoxipuwizutux.scienceontheweb.net/36562982101.pdf
    • http://santecmb-sarl.com/52898433690zbf5w.pdf
    • https://jusegopij.weebly.com/uploads/1/3/4/4/134480833/tetawe.pdf
    • https://pizupunaj.weebly.com/uploads/1/3/1/4/131406403/870671f2c.pdf
    • https://static.s123-cdn-static.com/uploads/4369318/normal_6008ceda7f752.pdf
    • https://cdn-cms.f-static.net/uploads/4379220/normal_601c64cf1a8f9.pdf
    • http://sexedate69.site/latest_odia_film_song_2018dukd7.pdf
    • https://tolejavufagus.weebly.com/uploads/1/3/1/4/131437822/nawas-zamexo-nejobonotatu.pdf
    • https://static.s123-cdn-static.com/uploads/4371788/normal_5fe0274825b01.pdf
    • https://cdn-cms.f-static.net/uploads/4451766/normal_5fe6d9c62b6f4.pdf
    • http://goligofalu.medianewsonline.com/reloading_supplies_las_vegas.pdf
    • http://bigops.fun/android_studio_update_version_numbertvjn7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sapirabiv.rf.gd/xugifagobegezasu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c4.bin
b364b181790e7628229d8a0af8e25e526527441e637d7b58c0cb7a7d6b398725		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 4940 bytes
font_01_sfnt_off0000f79f.bin
7af0119f4e5685a3c2a4684900537db582078aae5a8743c00331d31a9aba03a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 2044 bytes
font_02_sfnt_off0001010c.bin
8ad0145964d83fdbd6fb7432e202d7cee6bc5acc24e5d0d428d2a576dea993f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 11176 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.