Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea044f8bc3e9620e…

MALICIOUS

PDF

75.5 KB Created: 2021-02-16 02:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 248342ba2b79f6b9658309a5758b9fb4 SHA-1: 22f81b8d97707f9f1eb8098c6e9c0f2cab29f173 SHA-256: ea044f8bc3e9620ed0e2d81406d33e68dd58e06652b629756d162b49a841f8d1
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with a high concentration of them pointing to disposable hosting services and suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=the+life+changing+magic+of+tidying+up+book+review PDF link annotation
    • https://moworanapubo.weebly.com/uploads/1/3/4/6/134685821/8613073.pdfIn PDF document text
    • https://nupafosudivoz.weebly.com/uploads/1/3/2/6/132682156/befiw_fotopojeri.pdfIn PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/givolewikurepudugi.pdfIn PDF document text
    • https://dibigisilob.weebly.com/uploads/1/3/1/6/131607467/vuwubivut.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/8305565.pdfIn PDF document text
    • http://pornbustyvids.com/99715792126e0jt3.pdfIn PDF document text
    • https://wawowipibi.weebly.com/uploads/1/3/3/9/133997364/fipinul.pdfIn PDF document text
    • http://generalmassage.online/30104367776zi23s.pdfIn PDF document text
    • http://kreativoblako.com/fernie_alpine_ski_reporth7uqc.pdfIn PDF document text
    • https://xejinifinedi.weebly.com/uploads/1/3/5/3/135305438/zuvedapawizomot-manajemix-begunefosis-bonisa.pdfIn PDF document text
    • http://leopards.space/37233028489d8vhu.pdfIn PDF document text
    • http://yozi.store/gunijaxuvexuzegow3py1r.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/mipeboro/1706034441.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/31077544611.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/kidekisomuletujoxun.pdfIn PDF document text
    • http://kijijaxozaro.epizy.com/67884878982.pdfIn PDF document text
    • http://wetowotupime.rf.gd/xikotibedanirexewimig.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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 5796 bytes
SHA-256: 16fbdd6856d18bc133b8d098b4f6c92391c02806857c5419f5dec243be4ac097
font_01_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 10888 bytes
SHA-256: 7616442de6a34d04a424660a1f5c2914385a6f2af9480f68d64f058b98d55bc2

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