Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d77d2ef80393773…

MALICIOUS

PDF

85.1 KB Created: 2021-04-03 12:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d22f29d18cb37c2d8c7f8cb50a1c0200 SHA-1: 39460a04a66908f4bfc83e28155d0b52a70b3582 SHA-256: 0d77d2ef8039377301ce9f3b83fbeb2eddbfcb7413e98094fa71560188099a1f
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://jacksth.ru/aws?utm_term=carl+sagan+quotes+pale+blue+dot
    • http://grinallex.shop/1118016625va0zn.pdf
    • http://nepoxiduvilej.scienceontheweb.net/python_and_algorithmic_thinking.pdf
    • https://cdn.sqhk.co/dakagugi/jDRiegc/9768423477.pdf
    • http://1fps.ru/lagasoledijosofewukimqaewn.pdf
    • https://cdn.sqhk.co/vimexuda/jcanveC/8255324994.pdf
    • https://cdn.sqhk.co/romekeka/eibChdL/jarubidesujiwuxobokamoze.pdf
    • http://megalit-korolev.ru/chicken_pouches_canadaf85qy.pdf
    • http://pokovata.scienceontheweb.net/nawuvebenosetojogakumo.pdf
    • http://tifeguga.22web.org/seren.pdf
    • http://gavewedek.iblogger.org/juvalibiboxenibavigojiso.pdf
    • https://cdn.sqhk.co/nezosomoji/hwidhhf/gupew.pdf
    • http://bisapusid.mypressonline.com/xibomuninewebojobiwes.pdf
    • https://cdn.sqhk.co/roretuduva/rto9jaZ/omaha_transmission_repair_shops.pdf
    • http://summerita.fun/mativlaxyd.pdf
    • http://jerunuju.mypressonline.com/binge_eating_disorder.pdf
    • http://galoomer.online/black_and_decker_grass_hog_trimmer_replacement_batteryjvxsv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gotenukevepunin/83596017854.pdf
    • http://simavanexija.rf.gd/58747778611.pdf
    • http://xedawobu.atwebpages.com/fedufebisapevev.pdf
    • https://s3.amazonaws.com/kegubinefuda/kurosavovagegi.pdf
    • https://s3.amazonaws.com/xakajoziwibi/26222858962.pdf
    • http://rufowafom.epizy.com/crise_politique_dfinition.pdf
    • https://s3.amazonaws.com/punurum/copper_chef_baking_pan_recipes.pdf
    • http://zuzimadatunukag.rf.gd/beaglehole_epidemiologia_basica.pdf
    • http://wawikoduvebakap.onlinewebshop.net/rewemusadurukogasas.pdf
    • http://baxewape.myartsonline.com/calculus_1_book.pdf
    • https://s3.amazonaws.com/vukumesoj/41872304327.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001017b.bin
e7ca28c215a7f9b062467a4074a5d7cfe6f5c2eda2556db5ca90ae3547b4f6fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 5248 bytes
font_01_sfnt_off0001134e.bin
052110285f0dbf3dc6b04958349d5bf1bda8e2387e1cdd0d7ac1a91787ce8b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 10924 bytes
font_02_sfnt_off0001388f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1388F 4324 bytes

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