Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c1d2c441b5c7c7…

MALICIOUS

PDF

74.4 KB Created: 2021-03-08 17:07:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ef23a43e9219fb2466a8c65beaf1a9fb SHA-1: 5c297104d2d0b1bf78accbfec80730cef2de9d99 SHA-256: 12c1d2c441b5c7c78c6f60bdafbcd5ceda44f6bbc519b08b56250b2044da2db9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded content, though partially corrupted, appears to be a lure related to biological information, likely to entice clicks to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=what+are+the+differences+between+veins+arteries+and+capillaries PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383794/normal_603b082ff36a1.pdfIn PDF document text
    • http://vizionsmc.net/luxuzedizesejipavuwomivexddb5.pdfIn PDF document text
    • http://lavka-karamel.ru/campaign_strategymi6a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382629/normal_5fe51a71d071f.pdfIn PDF document text
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/lewamenis.pdfIn PDF document text
    • http://aov.one/bourdieu_forms_of_capital1sjtr.pdfIn PDF document text
    • http://clipshd.design/36_questions_that_lead_to_love_musicalqviij.pdfIn PDF document text
    • http://rentline.pro/cribbage_rules_pointsjh36v.pdfIn PDF document text
    • http://copyrightshelpscenters.com/89863487343t99q.pdfIn PDF document text
    • http://reduslimitalia-official.site/difference_between_wavelet_transform_and_fourier_transformzzrt0.pdfIn PDF document text
    • http://fringigejy.site/407418451238iyav.pdfIn PDF document text
    • https://xoravali.weebly.com/uploads/1/3/0/7/130775395/8583800.pdfIn PDF document text
    • http://subfamjtii.site/xofiwemaxetopuzovofivil5xlr.pdfIn PDF document text
    • http://astropsychology.website/up_b._ed_form_2018_apply_onlinegrxlf.pdfIn PDF document text
    • http://risurevisawibe.iblogger.org/31028692706.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_d64d369751b048edb8b01055c5e4696c.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_21df7dd219ed46cf888bd74fd918c7aa.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_31c1b7ce5b6242d1839417e4d7a95313.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_a5629d05e329450bb08565ed43673ccd.pdf?index=trueIn PDF document text
    • http://gorudagomi.rf.gd/performance_budgeting_slideshare.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_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 5548 bytes
SHA-256: 7102f3e3dd5128f48feff14455325d7cce44fcf575343c61b901d3de3923d3df
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 10312 bytes
SHA-256: ef52ec2dd9e910f2588f3b08e06aaaf330f098682dd6926d22b5c32bb141d2b4

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