Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eafc1a94df7ae09…

MALICIOUS

PDF

75.5 KB Created: 2021-03-03 20:37:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 964b05a529747ca0c1c110382fe7bef8 SHA-1: 83ffa60f9cce70dded056968903de6d83e54d3b7 SHA-256: 4eafc1a94df7ae09be42b91f52570b7d01bfe17bca5968b8caca19ec508dc6e0
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to SEO redirectors, with the primary lure URL being https://jacksth.ru/wix?keyword=amc12+cutoff+2020. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to direct users to potentially harmful content, consistent with phishing or malware distribution tactics.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/wix?keyword=amc12+cutoff+2020 PDF link annotation
    • https://ruxebawinafa.weebly.com/uploads/1/3/0/7/130776533/jujudepubojuj-pudutodijol-nokeruxubi-bukavadaxut.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/roxozu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fc7de78167df.pdfIn PDF document text
    • https://gogovujogizog.weebly.com/uploads/1/3/1/6/131607278/fonetupuwig.pdfIn PDF document text
    • https://bugomalaked.weebly.com/uploads/1/3/5/3/135324661/7efb3cf8a49.pdfIn PDF document text
    • https://fekalebewobazo.weebly.com/uploads/1/3/4/6/134668576/666cd27c903.pdfIn PDF document text
    • https://ziloboze.weebly.com/uploads/1/3/2/6/132683463/kujakiwurevij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_5fd657f3d085d.pdfIn PDF document text
    • https://xonokuraku.weebly.com/uploads/1/3/3/9/133988937/bakibuvusenidudo.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/perfect_english_grammar_reported_speech_video.pdfIn PDF document text
    • https://tuberosaguxe.weebly.com/uploads/1/3/1/4/131437792/zapunujinaligib-xuguvobipuz-gifoti.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/lomogas/fujopelobivuxupuzesex.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/dialectical_behavior_therapy_treatment_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/98520115905.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/physics_one_dimensional_motion_problems_answers.pdfIn PDF document text
    • http://tivapatovike.epizy.com/video_player_apk_android_2._2.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/chaitrada_chandrama_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/kulukajupejejefotoles.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/gro_bag_sleep_guide.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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 4828 bytes
SHA-256: abd978c7de30a97ffc92a9bb741ea7c6f93f29d3edbbdac9af38b78cd2b6f2ac
font_01_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 13768 bytes
SHA-256: 0fe866c68cd6daa38f8db544ebd967bf0419e4b36e275160198692e518362d3d

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