Malicious PDF — malware analysis report

Static analysis result for SHA-256 607f6df2a0e85cd8…

MALICIOUS

PDF

80.7 KB Created: 2021-05-18 23:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 014514c6f1a527f8090673fae2bc8e5a SHA-1: 57a3aa2a25d2c4cf476766dab986064c50d9d573 SHA-256: 607f6df2a0e85cd89cab4173db0a39b580f1ee2a21ff636e3bb7cec10db312ba
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://pelibifir.ru/strik?utm_term=1+cm3+de+agua+a+gramos', is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/strik?utm_term=1+cm3+de+agua+a+gramos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454988/normal_606948b5df4da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_60177c510893e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_601dd347a1270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446399/normal_5ffd6ed440c2d.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/cb9512742a8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5fe9e0bbc95c0.pdfIn PDF document text
    • https://poteluteko.weebly.com/uploads/1/3/1/1/131164474/jinabovazirojone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_5fdb346f16c2c.pdfIn PDF document text
    • https://jefevitekigo.weebly.com/uploads/1/3/4/5/134586767/5ac8d27.pdfIn PDF document text
    • http://gizaxeredemuni.22web.org/capex_opex_project_management.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_601b03b09ff16.pdfIn PDF document text
    • http://tiruxukanemaga.iblogger.org/free_las_vegas_bachelorette_itinerary_template.pdfIn PDF document text
    • http://jixoxegige.iblogger.org/academy_of_art_university_application.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://jokugagarin.rf.gd/pidamowufeguvofuforabesav.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/47481772879.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/namexuvalufelaxinon.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/liside.pdfIn 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_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 4996 bytes
SHA-256: bc92dcb8225d12f26fabd0ce0698cbb6a8a7dbf55ea7fe6427b11175d1713c6c
font_01_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 12592 bytes
SHA-256: 7b9a4faef06457063fc8277eb800543c48d3ef1b913fc16b633cf86c819248bb
font_02_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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