Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dd5f656d6f3e75…

MALICIOUS

PDF

74.6 KB Created: 2021-03-06 06:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f0b17c5bd8f1f8f3f4e41128217d5427 SHA-1: c341270c5dc2469221006759a8ac45046d96bf59 SHA-256: 63dd5f656d6f3e75f9d2f7c6eef013471d1f43952550ce99129210ee1769cc9f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm and contains external URIs. The PDF contains embedded URLs that likely lead to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://seumenha.ru/wix?keyword=ms+cooper+and+mr+cooper PDF link annotation
    • http://virnet77.ru/when_lights_are_low_benny_carterrzg3u.pdfIn PDF document text
    • http://zoomita.space/sag_modified_low_budget_ratesh983y.pdfIn PDF document text
    • http://upgrade4me.com/p90x_plus_scheduleif4hb.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/pegesugojoturefowulidu.pdfIn PDF document text
    • http://taxukubuxiwor.iblogger.org/jeju_olle_trail_17.pdfIn PDF document text
    • http://phrensy.co/900863644hu94e.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/motivational_interviewing_techniques_videos.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/integral_of_x_cos2x.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/sex_education_season_1_recap_hindi.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/jepavilutabilel/rest_industry_super_fund_nomination_form.pdfIn PDF document text
    • http://lukenulabimoz.rf.gd/65891274752.pdfIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_e6db735ece794c40b643e77578275859.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/roxawo/god_of_war_the_mountain_100_guide.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_23b5478601d44f73a2c997b82e0877de.pdf?index=trueIn PDF document text
    • http://rilulavonepuv.epizy.com/13610452703.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/bca_first_semester_books.pdfIn PDF document text
    • http://nefijojutofad.rf.gd/ccleaner_mobile_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/march_of_empires_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/how_to_take_off_delta_shower_faucet_handle.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_a7d3824be01c44d6a02b41d208e95bc1.pdf?index=trueIn 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_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 5192 bytes
SHA-256: 96877085ba5fac5a3f07ccfd84691d5f4ada268ee1b855a276ea83470e868566
font_01_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 10740 bytes
SHA-256: 847b1b3105e375ce0167a84ceb982e08fc2b7d30276668a458e8c98ced79d39e

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