Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28a78a83092fa6a…

MALICIOUS

PDF

76.2 KB Created: 2021-03-04 17:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f7e56c574b58c5a4b5ec01f37d14f354 SHA-1: 06242331a083ba8c032881337a6826f18aa047c4 SHA-256: b28a78a83092fa6ab8f53f23aedb8fd16d0f17971d95bbd2d6e720bc728570a9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to stress reduction techniques, which is likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://leonvi.ru/strik?utm_term=what+are+some+stress+reduction+techniques PDF link annotation
    • https://sesadawaroni.weebly.com/uploads/1/3/5/2/135295108/rosubepirera-wufugojetoji.pdfIn PDF document text
    • http://smartline58.ru/20_kw_kohler_generator_wiring_diagramrfexu.pdfIn PDF document text
    • http://stalekost.site/adobe_premiere_elements_2021_crack_download5dmwz.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/qpidhjR/59146271275.pdfIn PDF document text
    • http://eurostore.info/telapoziwixopabl9xo6.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/hihdwV8/warajurutelofosopo.pdfIn PDF document text
    • https://cdn.sqhk.co/jorevagu/Ndngdii/33320134262.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/xadogig_soxizagosatapav_vuvefu.pdfIn PDF document text
    • http://arm-watch1.club/nokofopifz8263.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/zefagalasizo-zipukixibix-jivokawar.pdfIn PDF document text
    • http://hookup681.site/toyota_camry_hybrid_se_2019_for_sale0cvcu.pdfIn PDF document text
    • http://wordsideget.top/vutemasidalimon4lobh.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/zelupuxitadulavomuxofijeletto4.pdfIn PDF document text
    • http://mazafaka69pussy.online/animal_crossing_wild_world_guide_bookqouoq.pdfIn PDF document text
    • http://linorusani.iblogger.org/91049674472.pdfIn PDF document text
    • http://boxberry-24.cc/bosesuvepukuvexuniwevakak598bj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://waxaravibew.epizy.com/96327040360.pdfIn PDF document text
    • http://bukaduxanob.epizy.com/xalezikogo.pdfIn PDF document text
    • http://zasufogokalo.rf.gd/45278356883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb16a8d-137f-48c5-afff-0e5386aa855c/types_of_interior_design_styles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc792b8-872d-4584-9f71-29b63754a824/how_to_export_blender_video_as_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e853b8-ff82-4f1d-9efc-b8b147298069/what_is_the_best_dog_for_hunting_wild_boar.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_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 5288 bytes
SHA-256: 6653f6505a3429c2147524ef69d3a91957354c9ea31e4308744ad06685f30f11
font_01_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 10820 bytes
SHA-256: 13c3462be5cf502e14593384193a62f647a62a544fb80167e7696bfb439b3876

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