Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4b0969077c32f5…

MALICIOUS

PDF

78.8 KB Created: 2021-04-28 07:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 89c4287d4e2889e164cb1b50255a1ad6 SHA-1: dab01bae3826a6d1b94e3a4d7a2c05dcfcfcad33 SHA-256: 7a4b0969077c32f52088fd3b5d8947d4ba551045304c8c68b1e78260f020d9b3
244 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical finding of a link to known malicious redirector infrastructure and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to search engine optimization and links, supporting the attack pattern of SEO manipulation or redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+much+does+mifi+cost+verizon In PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/7100355.pdfIn PDF document text
    • https://gupolapi.weebly.com/uploads/1/3/4/6/134629895/lumagewanijuzew-wenok.pdfIn PDF document text
    • https://fedalovojuxunod.weebly.com/uploads/1/3/0/7/130775560/zunib_dogebazuzan.pdfIn PDF document text
    • http://gesitaxipuvav.22web.org/quarter_life_crisis_adalah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_49fe67f91051421289d9c6b1912f82c5.pdf?index=trueIn PDF document text
    • http://kifozelig.epizy.com/probability_density_function_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1c9ff4-e8d5-42c7-a817-73cf41560f91/2018_dodge_grand_caravan_sxt_features.pdfIn PDF document text
    • http://nuxewetim.rf.gd/23210732941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818f19c4-66de-402e-8373-20009b9e81a6/samsung_s5_active_phone_price_philippines.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_5dd4e2d06f09469ea4621fabe3812205.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e987cb-10a3-4267-9d55-b740d87752fa/jivorapaxipolurenimekug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574e2314-a5f7-4e8b-be61-73b5005d3124/xunobawuzaguvidojagutag.pdfIn PDF document text
    • http://perabojon.rf.gd/because_he_lives_gaither.pdfIn PDF document text
    • http://tejojode.rf.gd/kegezutuderinonise.pdfIn PDF document text
    • http://kojomazudogog.epizy.com/75262592766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81db106b-2991-4466-a22a-f034ce130280/night_novel_packet_section_8_answers.pdfIn PDF document text
    • https://0f424234-9c27-4462-a606-4b2ccecf17d8.filesusr.com/ugd/b42a09_6eff09dc01484a0ebde2590b9d4efa10.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 5184 bytes
SHA-256: 51697a340ca6e1533c3dcee143f432a5259b7e3dcf6378df2c304b2217dd2770
font_01_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 11340 bytes
SHA-256: 8f6ba5954a055f5961beda9ded2cff526f19c5f1a12b333fa20c648ad9a43684

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