Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa9633e3c79d245…

MALICIOUS

PDF

124.2 KB Created: 2021-02-22 18:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 43c14ce9437f0ce47b9c96d5722f976e SHA-1: 8bad31a802dc3547455fc6cd21f37149e4e2e9d2 SHA-256: eaa9633e3c79d24502be2f1bd1938021e9d3538607cf17ff64bde11dbac2f1b7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The embedded URL 'https://jottigo.ru/strik?utm_term=soundarya+lahari+benefits+in+hindi' is a likely redirection point.

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://jottigo.ru/strik?utm_term=soundarya+lahari+benefits+in+hindi PDF link annotation
    • https://vivesajepud.weebly.com/uploads/1/3/0/9/130969004/4273166.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/8688006.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/pagudifoxov.pdfIn PDF document text
    • https://gokebapin.weebly.com/uploads/1/3/5/3/135320588/jiteru_kuvusubijemewo_rezeravin_fumazupikutoze.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/ifjf4Pp/cbc_world_cup_skiing_tv_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/6UbgglH/zojanen.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/zosozog_vadasesinasuve.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/594db04.pdfIn PDF document text
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/cf706269f.pdfIn PDF document text
    • http://sfr-webmail.com/drinkwell_ceramic_pagoda_pet_fountain_filterscoo2s.pdfIn PDF document text
    • https://riganekonima.weebly.com/uploads/1/3/0/8/130874133/6839821.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/ekzNjel/splash_canyon_crystal_caverns.pdfIn PDF document text
    • http://itwow.info/mandat_sepa_ordre_infirmier9liyc.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/3ee2c5040.pdfIn PDF document text
    • https://gobewuguwug.weebly.com/uploads/1/3/6/0/136056794/kovovogukad-kejiweza-fabanuki-bomufuwij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001ac83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC83 5340 bytes
SHA-256: 59d8d6b8b45c6fdae8950e77367027060de52e07118070daa38133648e458956
font_01_sfnt_off0001bea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEA7 10616 bytes
SHA-256: c7b19424938e91da34a0323c9dcb3705fb9dd1ad49522a4e3034ae70b2ed7e9b

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