Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4eea63bf96e165…

MALICIOUS

PDF

80.7 KB Created: 2021-03-17 18:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d8456048694daf9f83f6dd5e8b4ed7af SHA-1: 5025a06839e86cf4d3d6c7b3044ffd47d95ee067 SHA-256: 7d4eea63bf96e1656493998f6d351eed676feabc6e5fd7fd9753b45e8228fde4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains or suspicious hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

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://druttle.ru/strik?utm_term=4th+grade+envision+math+book+answers PDF link annotation
    • https://cdn.sqhk.co/dufolatik/hj4VCz0/votafizufuw.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/qjdXJih/welujor.pdfIn PDF document text
    • https://kedabivaj.weebly.com/uploads/1/3/1/4/131438143/042d708.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/desedemij_vulufupolatol_razagiwa.pdfIn PDF document text
    • http://nazawate.iblogger.org/love_good_morning_pics.pdfIn PDF document text
    • https://pomitowu.weebly.com/uploads/1/3/4/3/134389192/68a99ae.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/fgfVMge/baby_princess_coloring_book_pages.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/2dceafd.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuxopova/cwVlIgf/xemevosupamulapag.pdfIn PDF document text
    • https://lepefolavexar.weebly.com/uploads/1/3/0/8/130874674/fa9eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_4e679192b2294d7f9162e5f1393c0f47.pdf?index=trueIn PDF document text
    • http://gasukexopesifu.epizy.com/28766861965.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/whatsapp_for_nokia_216_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/poxanejusazekivewi.pdfIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_94e890160e5045e8abbb5c16f45426d1.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_507e3d1cad784a4b901fd35142905097.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 5344 bytes
SHA-256: 70b39421000ddd9601b064aba5db56f40995a82d0f23ff97d393820efd624b52
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 11356 bytes
SHA-256: 1a94d46ac134a096991e28659788c009363c4390f967d243204c58d4398fe503
font_02_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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