Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e53905fcb66403b…

MALICIOUS

PDF

78.4 KB Created: 2021-03-13 16:58:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7d9eecd500a74069788b54579e610a48 SHA-1: 95ef184d3504331af42dfcf447ac41949e72de3f SHA-256: 4e53905fcb66403b3de580705e5008efe3465a3c39894f3b4404ae196d927203
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=how+many+quarts+of+oil+does+a+2012+6.7+powerstroke+take PDF link annotation
    • http://xilutemomeliro.iblogger.org/gold_foil_sheet_mask_benefits.pdfIn PDF document text
    • https://tezubowaxax.weebly.com/uploads/1/3/4/6/134640868/649013.pdfIn PDF document text
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/8061e2.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/verirejon/career_path_powerpoint_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/74116294112.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/construction_company_organizational_structure.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_1727d9153e734a3b96852dd1de073aa8.pdf?index=trueIn PDF document text
    • http://vujesidewu.rf.gd/96809144692.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/mevuvosor.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/76800844449.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/bansuri_tune_free.pdfIn PDF document text
    • http://babupit.epizy.com/mulagazotiripele.pdfIn PDF document text
    • http://jobifizokugo.rf.gd/dinosaur_king_arcade_game_battle_free.pdfIn PDF document text
    • http://lizolubemerawi.epizy.com/rumuj.pdfIn PDF document text
    • http://sejofinudagiji.epizy.com/39825743082.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_ea63cec5df8f4e5d9f7bb3955d149151.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/new_pokemon_gba_games_free.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_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 6124 bytes
SHA-256: 7c735004ea89cbecc3e006294a43b3d4015df1eacabacbae38890a86eedb0c9e
font_01_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 11764 bytes
SHA-256: cd7ac0aeff9233eb50f7823e6399c1c97b7f48c3d995b9abb75c1d720f41f8e6

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