Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79b49b7a0fcaf5b…

MALICIOUS

PDF

63.3 KB Created: 2020-11-10 21:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a2f2b87c45630b17b650b9089edab5a0 SHA-1: b66d353a4ba47665d00d2f7335a45d05d8cc4f55 SHA-256: d79b49b7a0fcaf5b3b30da090309c586210da9f1c2ba2278987cb30dab653823
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The primary external URI points to 'trafffe.ru', likely an attempt to redirect the user to malicious content.

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 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.
  • 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://trafffe.ru/123?keyword=valence+electrons+activity+worksheet+pdf PDF link annotation
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/wijelul_fovarofe_gomewidefo_tipoxomifirovo.pdfIn PDF document text
    • https://kodopikowi.weebly.com/uploads/1/3/4/6/134659436/3962181.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/8cea94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f8b6fe64b354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5f9b9940b97c9.pdfIn PDF document text
    • https://sapafusazefo.weebly.com/uploads/1/3/4/4/134496158/puwogusixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_5f8a1219c0196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5f904d72c246f.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/gitipelut/powexakuzumiwak.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/marketing_research_file_download.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/rolls_royce_silver_shadow_for_sale_cheap.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/wakanejaximat.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/vozusalurefanazebikejupa.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/mcdonalds_coupons_oktober_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/bradford_exchange_phone_number_800.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/xopegudolebigawodufisevib.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_off0000ba55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA55 5524 bytes
SHA-256: 6fd548f7305c60dfc809484d7cdfa92fc28f5796def6ddc3f6fcbf3df9c48165
font_01_sfnt_off0000cd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 10188 bytes
SHA-256: fcedc34cce5e2f4f03b83e480764930b56640006a6b11b16d3a061468f5afa64

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