Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcbc3d4f62f72c9…

MALICIOUS

PDF

78.4 KB Created: 2021-03-28 23:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e65e32e71c04e5d42ce670af5ca148d1 SHA-1: 96a77db6d144a68d25e0aa0af49c43c1caec263b SHA-256: 9dcbc3d4f62f72c98ceec62198ce940cf5ea2260cd94cf09d91c137e973dc627
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/wix?keyword=chemistry+chapter+8+review+worksheet+answers
    • http://mebosopevux.iblogger.org/alcatel_7210_configuration_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4480174/normal_601f56b64a53b.pdf
    • http://bikomowaxibujoj.medianewsonline.com/realtek_high_definition_audio_driver_ac97_windows_7.pdf
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5feb285a183ef.pdf
    • https://texupofomisuz.weebly.com/uploads/1/3/4/2/134235579/d20a2f234.pdf
    • https://cdn-cms.f-static.net/uploads/4374848/normal_6042e24a155f8.pdf
    • http://baditunabupiru.mywebcommunity.org/31323453735.pdf
    • http://siluvuxifebul.medianewsonline.com/create_barcode_online.pdf
    • http://gometug.22web.org/how_to_replace_hp_8610_printhead.pdf
    • https://cdn-cms.f-static.net/uploads/4488137/normal_603fa170e3fb1.pdf
    • http://kiwenalod.medianewsonline.com/lonobivogezuz.pdf
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/4559868.pdf
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fdab218008de.pdf
    • https://tepevigiroj.weebly.com/uploads/1/3/4/6/134672536/xurutewoderewa.pdf
    • https://xowanejizaki.weebly.com/uploads/1/3/1/8/131871556/setojakagejugav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kiguteperilodu/remuz.pdf
    • https://s3.amazonaws.com/zubuwujoxom/arithmetic_sequence_practice_worksheet_answers.pdf
    • https://s3.amazonaws.com/lofese/free_expense_tracking_template.pdf
    • http://nubibubimalepik.atwebpages.com/99678328126.pdf
    • https://s3.amazonaws.com/luworizesupox/how_long_is_paternity_leave_in_the_us.pdf
    • http://sipuwoweno.rf.gd/roxekigabatemulilab.pdf
    • https://s3.amazonaws.com/dusined/836315593.pdf
    • https://s3.amazonaws.com/libusamagowuvo/zagitutenizumol.pdf
    • https://s3.amazonaws.com/pegek/43982895435.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_off0000f402.bin
dd6b032e43cf499aa9d659b85ed08b261ecacb5fd5313ca9851a522a12f997e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 5556 bytes
font_01_sfnt_off000106d4.bin
54f2b050196831685d14de1e44ed60e5497f76c8072813af61e3ab1af28b2a1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 10992 bytes

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