Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1a97b871b44910…

MALICIOUS

PDF

84.6 KB Created: 2021-04-05 06:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c7282cd855bf7652ef500bf397a61947 SHA-1: 2dd7099ef3745caee5ede8aa6133393f9985d0ad SHA-256: cf1a97b871b4491091940b227d24f6f3bc1f329ad47a2e4fdab145761ad353cd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the heuristic firings strongly indicate that this document is designed to redirect users to malicious websites, potentially for further exploitation or credential harvesting.

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://ponafet.ru/strik?utm_term=costa+rica+itinerary+7+days+lonely+planet PDF link annotation
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/b81779af34337.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/vivipaxomebagope.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/niwarutexuvilinokix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_60548215e58a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409403/normal_6042ffbc48006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_60687171dfc86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_605b2199d7fe8.pdfIn PDF document text
    • http://vofufime.mypressonline.com/fitivutabikopexesek.pdfIn PDF document text
    • http://bubuwem.iblogger.org/faruzewafukanumepigasixi.pdfIn PDF document text
    • https://waxusebodik.weebly.com/uploads/1/3/4/5/134529962/841adc554.pdfIn PDF document text
    • http://mapomuwila.22web.org/29214560136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459788/normal_60003fdd3550d.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/black_and_decker_handy_steamer.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/kujexamexibavazomow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jonisijuxopud.epizy.com/zezewijiwibudalexugu.pdfIn PDF document text
    • http://vonubopoz.rf.gd/kia_cerato_2013_manual.pdfIn PDF document text
    • http://mazolofoju.epizy.com/33362111616.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 5156 bytes
SHA-256: 8d3955e10a19887cc0d65ff201594118da9c7ae305b05d04c64fa5b1a99f5f4f
font_01_sfnt_off00011c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 11724 bytes
SHA-256: 64185e558cbe90755da2adcae447e933cbb0d2f9c26e4ce13250832c9e9021a7

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