Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee6162821605f17…

MALICIOUS

PDF

77.9 KB Created: 2021-04-07 20:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c23971efbc7b53ba31c2ed969b72b9fb SHA-1: 4f521bf9825a80c4a233cf4661e5ed1ee4a69e7c SHA-256: aee6162821605f172260a05f2e3425f473653e05fa911a03bf4c4c8df262eab4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to appliance troubleshooting, designed to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://botokaw.ru/strik?utm_term=why+is+my+maytag+washer+not+spinning
    • https://suwurivuta.weebly.com/uploads/1/3/0/7/130775320/witutorira_tufoxuzisavifi_bopikodorezis.pdf
    • http://mazafaka69pussy.online/nimekexofipezegkvq0r.pdf
    • http://vittorguxx.site/can_you_weld_aluminum_with_hobart_140k6tgv.pdf
    • http://wisatemubudu.medianewsonline.com/69847324377.pdf
    • https://cdn-cms.f-static.net/uploads/4377391/normal_603a85d551929.pdf
    • https://cdn.sqhk.co/wusakituzu/NvCjhjd/bunuxazekesorefododejif.pdf
    • https://cdn.sqhk.co/goduwonon/d1jb7dA/95180265466.pdf
    • https://static.s123-cdn-static.com/uploads/4366645/normal_5fdd87e446638.pdf
    • https://cdn.sqhk.co/gevopobi/dKibQ1M/north_and_south_movie_free_download.pdf
    • http://myluckywin.site/stocks_to_buy_under_5_rsucc3p.pdf
    • http://medemukiduba.sportsontheweb.net/how_to_set_up_moultrie_mobile_camera.pdf
    • https://lobigemef.weebly.com/uploads/1/3/2/3/132303116/06f023bd95.pdf
    • https://cdn.sqhk.co/zanaforare/ijsbhcp/gojiwizavu.pdf
    • https://cdn-cms.f-static.net/uploads/4424637/normal_604ceb465fbef.pdf
    • https://cdn.sqhk.co/zizenozi/h2grgfa/tomuvi.pdf
    • http://mekapetakosa.22web.org/xewuvekeroduketak.pdf
    • https://ribarifi.weebly.com/uploads/1/3/4/2/134266405/safafij.pdf
    • https://molipose.weebly.com/uploads/1/3/4/6/134644393/zazemeduxesuruk-pudelozulex-vokakumisafi-sojukovuxivat.pdf
    • http://lixorajepidil.mygamesonline.org/change_management_competency_examples.pdf
    • https://cdn-cms.f-static.net/uploads/4419003/normal_601b975e2c932.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sibexelopuni.epizy.com/dont_listen_to_music_while_working_out.pdf
    • http://mujopoweter.rf.gd/29576738453.pdf
    • http://zijemuviwovo.rf.gd/14918782773.pdf
    • http://rutukoka.epizy.com/bukifusazatexu.pdf
    • http://vuzuwukef.atwebpages.com/74663416586.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_off0000e4a3.bin
59d1e82ade4917c946e590bb397cb4880ad95f5620a484fe7d5b1f66fb01b8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 5196 bytes
font_01_sfnt_off0000f635.bin
23e2ae78d90c31cdd0dc5499c9d202844831e1804cef9ee474d5b4c1a5bc9738		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 10608 bytes
font_02_sfnt_off00011a03.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 4324 bytes

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