Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68c80603fae3558…

MALICIOUS

PDF

69.2 KB Created: 2021-03-15 15:23:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6559e46cb5da29feb843a06de030113 SHA-1: e9e1a12e4d2e0a8e1480ce0640e84b30a6d8dd72 SHA-256: a68c80603fae35580ef2b1525ac029b3f57c3283ba80e5f25eac671ac4c54ba3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-farmed, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=ryobi+hammer+drill+corded+manual
    • http://pakisonuzaruwav.iblogger.org/delaware_county_ohio_auditor_forms.pdf
    • https://cdn.sqhk.co/sileluzorupo/j7hin12/95210269248.pdf
    • https://cdn.sqhk.co/lojibuwe/hj9hgjc/29486609886.pdf
    • http://masuxolujetub.22web.org/69548396110.pdf
    • https://cdn.sqhk.co/wibetaxor/jeUyRjj/prime_video_app_for_mi_android_tv.pdf
    • https://cdn.sqhk.co/fenazijeguk/hieYN3G/xebugu.pdf
    • https://cdn.sqhk.co/maxevurux/igaIjbv/followers_unfollowers_apk_ios.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b2fac854-9b0f-4b61-877b-34621fb6f186/general_chemistry_linus_pauling_download.pdf
    • https://uploads.strikinglycdn.com/files/d77696e9-fb87-4acf-8280-e37239b3ebac/what_does_module_in_education_means.pdf
    • https://s3.amazonaws.com/divelikubapiwaj/fejojejubu.pdf
    • https://s3.amazonaws.com/safenalavojuwu/why_is_my_rv_fridge_not_getting_cold_enough.pdf
    • http://gisoduriri.rf.gd/how_to_apply_for_state_id_in_hawaii.pdf
    • https://uploads.strikinglycdn.com/files/b46bb52f-3460-458f-b0ea-a33f1d4eb35f/ssr_125_piston_size.pdf
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_61b5d1f7f20f43f7b04a08f41ab06d38.pdf?index=true
    • https://s3.amazonaws.com/legipalofi/double_digit_addition_worksheets_for_2nd_grade.pdf
    • http://pirajog.epizy.com/english_to_afrikaans_dictionary_apk.pdf
    • https://s3.amazonaws.com/tesasubawalozan/tv_live_application.pdf
    • https://s3.amazonaws.com/tixedujegibex/bikovudetafote.pdf
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_9ae6dc43d3ac47a0aded18a67e0599e4.pdf?index=true
    • https://s3.amazonaws.com/podawakumepewez/52277927489.pdf
    • https://s3.amazonaws.com/kukazowox/ayala_corporation_stock_performance.pdf
    • https://s3.amazonaws.com/kovezodepugov/nalasarunun.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31c.bin
b40c229976ba35c81d82694504a894ffad8730a55196b9cbf65ace4e11bbf958		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD31C 5248 bytes
font_01_sfnt_off0000e4d5.bin
5806a011e2a80d25b5681270badd39ff0341afe141891613f8ac509fd719ad97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 10104 bytes

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