Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0bc32c219464d9…

MALICIOUS

PDF

84.6 KB Created: 2021-03-18 20:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c9a7d8d100f6173fb05bb0eab1b1714 SHA-1: b73d75ab8ba259d079d380819db412cc89cb98d1 SHA-256: ad0bc32c219464d9f528db2fcb5a1ac9b07dd59fae609efdf405f04d31133333
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs point to potentially malicious domains, suggesting an attempt to redirect users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=tales+from+above+the+loop+rotten+tomatoes
    • http://gepanukotex.getenjoyment.net/how_to_use_strongs_concordance.pdf
    • http://risumeboze.getenjoyment.net/bossy_president_novel.pdf
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/5995767.pdf
    • https://fetepidema.weebly.com/uploads/1/3/4/6/134684810/nijekapomiv-xusol-kikuxuwovase.pdf
    • http://trastqort.online/zelij1zu1p.pdf
    • http://firstflirts.site/58930460783scfrb.pdf
    • http://reduslimitalia-official.site/bojopuzituve05mb.pdf
    • http://pubggaming.online/23128611387nqmzx.pdf
    • http://rijewomel.scienceontheweb.net/cecelib_possessive_series_1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/99aaf1bf-11b0-4325-9369-8f0cbcf12435/who_manufactures_snap_on_torque_wrenches.pdf
    • https://uploads.strikinglycdn.com/files/bb401728-905c-4051-9cc2-be7472a3f790/powerwise_charger_amp_meter_not_working.pdf
    • https://s3.amazonaws.com/jazuravazaguz/87295956812.pdf
    • https://uploads.strikinglycdn.com/files/d2eac711-7be7-4c0f-aebd-29cf6cbe3080/75325152017.pdf
    • https://uploads.strikinglycdn.com/files/aec8ebbf-6dd4-432a-b8e5-3110df00435a/9070134304.pdf
    • https://uploads.strikinglycdn.com/files/ac9bc4ea-4098-4924-8498-f516dd344b95/fl_studio_12_tutorial_download.pdf
    • https://s3.amazonaws.com/vosimalume/addendum_template_word_document.pdf
    • https://uploads.strikinglycdn.com/files/531a3d5b-2890-4c32-ac06-2b300d7de1a8/how_to_do_cover_page_for_research_paper_mla_format.pdf
    • https://s3.amazonaws.com/woxotopapozokev/credit_note_format_in_excel.pdf
    • https://uploads.strikinglycdn.com/files/f6de0c5f-35ee-421c-8b23-983454e27ccc/rumojividaresoxawepat.pdf
    • https://uploads.strikinglycdn.com/files/5a65ca4c-19e1-43fe-a0ce-69e10078e2d4/sentinels_of_the_multiverse_steam_unlock_variants.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_off0000fb99.bin
d501dc87db31bfeb5e381fff78efb518e96dd9688097ba5d9566a5d85c95b548		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 5292 bytes
font_01_sfnt_off00010d6e.bin
5a138c362ddd06713e68d5d72f4d44ed0ff814284ce81674b576d8f4fb0b904f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 18548 bytes

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