Malicious PDF — malware analysis report

Static analysis result for SHA-256 1628acbc44c9299f…

MALICIOUS

PDF

78.4 KB Created: 2021-03-04 20:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 03ae052b397ec40c07786fd4bef854c4 SHA-1: 9e04c8ef54064f3aa17cb0888d3279c603e3259b SHA-256: 1628acbc44c9299f256a8aa80e1dfe1871707216c5ef0b06538c1aca4ac53a27
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/strik?utm_term=the+lost+books+of+the+bible PDF link annotation
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/reravazube_dazoropamadifim_nuwok.pdfIn PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/c28882d0.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/6431055.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/silewasesel.pdfIn PDF document text
    • https://safuziketuxoxu.weebly.com/uploads/1/3/0/8/130814855/1647985.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/91743063626.pdfIn PDF document text
    • https://xadularapiro.weebly.com/uploads/1/3/1/4/131437383/f5e193ee25a.pdfIn PDF document text
    • https://bugojexipu.weebly.com/uploads/1/3/1/3/131398417/3290564.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/8835351.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/cual_es_la_estructura_del_texto_narrativo_wikipedia.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/47809737961.pdfIn PDF document text
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/843534.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/jojulolazedu-mitobilat.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/13576334239.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/9964452809.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/4299093.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojosire.epizy.com/kerala_flood_report_writing_100_words.pdfIn PDF document text
    • http://mifotabelimudon.myartsonline.com/fadozilukezugasakazoju.pdfIn PDF document text
    • http://repajazofuwide.epizy.com/abbyy_finereader_free_softonic.pdfIn PDF document text
    • http://tirinusodobo.epizy.com/58917252606.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 4704 bytes
SHA-256: af8cf88d5bebc6f8429ee4e53adf80afdb04ae1a1384db1d5930f3a174e454c3
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 10968 bytes
SHA-256: 95445710a7040ef99adcf7a62592deb5065f6588f86b68bb13a94838345ee9eb

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