Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ead8197cffccbb1…

MALICIOUS

PDF

68.6 KB Created: 2021-02-14 17:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 19c770af7e5d926dd555bd8d2db9aa29 SHA-1: 40231bf67a8a34c3b02fbeb2a144ff447353d630 SHA-256: 8ead8197cffccbb1622a6ae31cf79531af6c1a369443d8468824114fe81990fd
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains and known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is part of a phishing or malware distribution campaign. No scripts were extracted, but the presence of malicious links is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://yafferge.ru/wix?keyword=daltons+farm+toys+hours In PDF document text
    • http://newberginvestmentproperty.com/963539523697l0zr.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/tixusepewiboxavuvofifafasgo1bf.pdfIn PDF document text
    • https://pazudafodimaje.weebly.com/uploads/1/3/0/7/130776249/dupuvupopi.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/25222164227uvbpj.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/529ea167ca0af.pdfIn PDF document text
    • http://maturibcgj.space/radijijanilujelesasojesetbq3dh.pdfIn PDF document text
    • http://oneitstore.info/julitufetatujuw3f8za.pdfIn PDF document text
    • https://buroxaserojer.weebly.com/uploads/1/3/1/0/131070485/f01cafbbe483da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_60273076109c5.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/tBYFigO/aws_iot_architecture_best_practices.pdfIn PDF document text
    • http://reduslimitalia-official.site/falaxojanakurekesugimedif8jm6i.pdfIn PDF document text
    • http://fredo.bike/toy_donation_requestn9id4.pdfIn PDF document text
    • http://file-id.ru/sobefaderuv0afj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_60091c03ea902.pdfIn PDF document text
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/fedoxo-fezejubirebelez-zukegipimepivos-zogopigitawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450506/normal_5fc6f9134d1e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_601ef8e049cf0.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/CDheDJ2/donoxolibonerexikumev.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/fonazuzixagizir/81949120337.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/micelle_formation_surfactant.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/48229318230.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_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 5108 bytes
SHA-256: 411f058ebeda8e2c0067b321a6df547d5e80ea234c7f25e3a354c1d7d204996f
font_01_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 9960 bytes
SHA-256: 5b03cef982f7cd168ffaf1cd4b417b5180f6401869fee332af9556a9b17ffd91

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