Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4cf2eaf817e4af…

MALICIOUS

PDF

75.6 KB Created: 2021-02-27 18:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 82f532d6d04171f80feb67761d757e19 SHA-1: b018b55d5062b092ec441303d563af50ea822ff0 SHA-256: 8b4cf2eaf817e4af65ac380b0effe27f0006d30ecf0ef38d28d70f028233737c
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. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports this conclusion. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to redirect users to malicious sites 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://xajibur.ru/award?keyword=witcher+books+vs+games+reddit PDF link annotation
    • http://lizowaw.scienceontheweb.net/55046095826.pdfIn PDF document text
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/nolezebokur_dovoka.pdfIn PDF document text
    • http://policyhelpcenter.com/16077845014y3ozk.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/gedura-ribebud-xasowexanix-denevumiz.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/84979080236.pdfIn PDF document text
    • https://zuvumurujibuza.weebly.com/uploads/1/3/0/7/130739557/f5cafacfcd203.pdfIn PDF document text
    • http://raffle.website/michael_pollan_64_food_rules_lists3tk7.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/572e79837.pdfIn PDF document text
    • http://boxberry-24.cc/damelodibozejipy8i.pdfIn PDF document text
    • http://misstourist.info/rapujutajanu85tb9.pdfIn PDF document text
    • https://maduzoxunixeg.weebly.com/uploads/1/3/0/7/130775653/d0b325f137f7.pdfIn PDF document text
    • http://paktum.pro/14424830464glvch.pdfIn PDF document text
    • https://kunejadisitezan.weebly.com/uploads/1/3/4/0/134096254/c78e860c9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/types_of_service_manuals.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/72864431009.pdfIn PDF document text
    • http://damabop.epizy.com/biology_past_questions.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/how_do_you_do_zero_waste.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/saga_of_tanya_the_evil_light_novel_download.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_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 5596 bytes
SHA-256: 2b741119a75004d4db4dcef2bd8495fa6f2af2244167d7b891125790ed4d8931
font_01_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 10400 bytes
SHA-256: 767b5c481fd22450358c135cf53bf0dcd33b274b79696aa475467289ed574040

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