Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dad0e1aa5eb4629…

MALICIOUS

PDF

80.2 KB Created: 2021-03-20 21:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35db2d205f76b9629f75c18d693a123c SHA-1: 7d7d5b5060d568cfc4993f11fa25358e2967d77e SHA-256: 6dad0e1aa5eb4629e9432bb73f4b1087eb77e425ed032bc3af632cfc73af1dd1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The primary URL, 'https://lozipotod.ru/aws?utm_term=best+book+for+gre+preparation+2019', is presented as a resource for GRE preparation, a common lure for phishing or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/aws?utm_term=best+book+for+gre+preparation+2019
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/tosorutepovozadezebu.pdf
    • http://mawiratuwulu.iblogger.org/deruvune.pdf
    • http://zisezamerares.mygamesonline.org/134895353.pdf
    • http://tetizeniwa.mypressonline.com/ropogagutore.pdf
    • https://kekipunoze.weebly.com/uploads/1/3/4/6/134601808/5853245.pdf
    • http://gigezojiradof.scienceontheweb.net/887025848.pdf
    • https://jokisutenewaj.weebly.com/uploads/1/3/1/4/131483229/mivadidojukeg-waduzataduzimev.pdf
    • http://hq-cleartv.info/xivefinevavebekipibokokug6mccm.pdf
    • http://sodalabs.pro/leselewesotujirizurumexotogv.pdf
    • http://online-bestshop.xyz/enseanzas_biblicas_para_jovenes_en3pogu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pipaneku/boosting_algorithm.pdf
    • http://pisisagul.epizy.com/what_color_does_not_absorb_heat.pdf
    • https://s3.amazonaws.com/xujitezu/rejutifoji.pdf
    • https://s3.amazonaws.com/toliwudalamem/dexipavafezofanalu.pdf
    • https://s3.amazonaws.com/baposivarabuj/7591858771.pdf
    • https://s3.amazonaws.com/vibuvomomuv/apowermirror_android_crack.pdf
    • http://lenamopotinapar.epizy.com/answer_sheet_toeic_iig.pdf
    • http://bobupugarini.epizy.com/gewanajunekimulemubewiguf.pdf
    • http://madigekole.onlinewebshop.net/53494898762.pdf
    • https://s3.amazonaws.com/zuwimadaneb/85940256196.pdf
    • http://wofufudemito.epizy.com/kolovetokamigotaxorubopaw.pdf
    • https://s3.amazonaws.com/verirejon/xasizoxibamopuril.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_off0000ee05.bin
417d1ae6fd08e889d4b3d8a417e050c90522f97db76784210c869528f8ecfcbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 5560 bytes
font_01_sfnt_off000100f8.bin
f4d36f7e82ea183af2e1307c061eb4529f5bc017cfe11a3fa505e90e6cb44410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 10816 bytes
font_02_sfnt_off00012568.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12568 4324 bytes

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