Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5cd5195b0992f9…

MALICIOUS

PDF

79.4 KB Created: 2021-04-10 07:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c710f0aa857f4d4bce411b421d3b6243 SHA-1: f1e15895e3eedd7aa99af1bb04f853bad49e0bcf SHA-256: bc5cd5195b0992f9e1854ce292afbd5d42407ab6138cd3abba6969a81e5b01a3
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, and is identified as a link farm. The embedded content, though heavily obfuscated, suggests an attempt to redirect users to malicious sites like 'https://jumiwimov.ru/strik?utm_term=military+phonetic+alphabet+slang' for potential phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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/strik?utm_term=military+phonetic+alphabet+slang PDF link annotation
    • https://wuxagukokixeg.weebly.com/uploads/1/3/5/3/135398542/sivirakivosazo.pdfIn PDF document text
    • http://ladebizelase.scienceontheweb.net/magumojikusaz.pdfIn PDF document text
    • https://luwigemo.weebly.com/uploads/1/3/4/5/134597726/2037963.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/d56f30c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_6017a577e2be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489713/normal_5fdb8afda755f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5fdae2d1473a3.pdfIn PDF document text
    • https://zekawumili.weebly.com/uploads/1/3/4/4/134403966/9288531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408858/normal_5fc5731859ee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_6016351238b2d.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/60263164924.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451940/normal_5ff87dbcaaccf.pdfIn PDF document text
    • https://nolenefin.weebly.com/uploads/1/3/4/6/134629259/3039946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_60228b110e03d.pdfIn PDF document text
    • http://basidugom.mygamesonline.org/77279389579.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nobapizasiwe.myartsonline.com/documents_presentation_memorandum_of_association_articles_of_association_project.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/nizatimakaminipisiw.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_36871e94d4d14562a63b4407bb962eff.pdf?index=trueIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_00f802c444424982a419c83f190e5238.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_d9964841877745ac92a00b4513fbc4b0.pdf?index=trueIn PDF document text
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_4ba44a90dcf0466fa12e03c6c8a7f4b0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 5232 bytes
SHA-256: 3d5497fc2a9601e5cea7b37da2e3ed23af73fd248e15e1f9791b8bc0d6695af0
font_01_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 11060 bytes
SHA-256: 9afd3ca146f3c30dadec63c00793b837d8fa7fd6f97193aaf5952b73a0509154
font_02_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34