Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23f6cc0615fcf57…

MALICIOUS

PDF

86.3 KB Created: 2021-02-17 17:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6386b29a0dd5fe63aa564b300d32809a SHA-1: 024622f61eb2f3087c5af63bda89c0b6c836795f SHA-256: a23f6cc0615fcf57abe0b93eadf7f44ac1856c63c0eb6f90a43d1009612c2de1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though partially corrupted, suggests a lure related to educational worksheets, likely to trick users into visiting the malicious URLs for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/123?utm_term=solving+absolute+value+equations+and+inequalities+worksheet+answer+key+algebra+1 PDF link annotation
    • http://rajedat.iblogger.org/nasomi_goldsmithing_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/dibjd3W/72864620221.pdfIn PDF document text
    • https://cdn.sqhk.co/kilalovuge/Mhigdhh/1521701341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_5fd8b068113d6.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/BHlWjiq/17944466498.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/zOhcFh1/herobrine_skins_skin_bobby_bobby1545.pdfIn PDF document text
    • https://vimebadexij.weebly.com/uploads/1/3/5/2/135295776/8ab071d42800f8.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/lijepalamepefezes.pdfIn PDF document text
    • https://fisadurubimu.weebly.com/uploads/1/3/1/4/131409264/c657de9.pdfIn PDF document text
    • https://gemaxapofa.weebly.com/uploads/1/3/2/6/132681544/kuvuxako_kufajexibus.pdfIn PDF document text
    • http://zakunofukar.iblogger.org/40275978901.pdfIn PDF document text
    • https://kilekawu.weebly.com/uploads/1/3/4/8/134857711/5087783.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/jupevuxirapi/susubedeworobutipoxawibu.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/cricket_score_sheet_signs.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/nutoxuvirovubusogaze.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/1734332719.pdfIn PDF document text
    • http://dewenulemugu.epizy.com/crash_bandicoot_xbox_1.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/ulala_idle_adventure_guide_boss.pdfIn PDF document text
    • http://notewewagegev.rf.gd/giorno_theme_sheet_music_boss.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/aquamarine_full_movie_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/kavowowalakinodovilatiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/report_unstamped_mail_in_mailbox.pdfIn PDF document text
    • http://gomiguru.epizy.com/33033989979.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 5828 bytes
SHA-256: 0d24987e22b82ace8a47d22f0a2252bdd26ae3d49afb9e79bdb6d9d6988a2dac
font_01_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 12920 bytes
SHA-256: 95e527f0f09cbf8ef1b23e282576dd613220fa0356a954a146f0a71d18d9191d
font_02_sfnt_off000134f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F5 16224 bytes
SHA-256: 8472a829c76df9ff19d4874f3323edf97ef4a91def01874bdf433d47a3d950ba

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