Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b57951dcfbf7daa…

MALICIOUS

PDF

79.5 KB Created: 2021-03-11 07:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7ad6566e9be9da8979f7b235876f1afa SHA-1: 1b8dc27b7fc7fd46a02a691fee3c0432d30398ae SHA-256: 1b57951dcfbf7daa0a28f46fef7809eabb2313d70431970e7b7bde9f8b614291
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://nipisod.ru/strik?utm_term=chinese+character+dictionary+draw+online PDF link annotation
    • https://cdn.sqhk.co/rebosuvut/eHjiagd/offroad_drive_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/hfhfgie/e_accent_aigu_chromebook.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/4541917.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/jjmja2g/zefavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423715/normal_5fe7e79b524c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_6010ac3a6beee.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/PWyhfm4/87929342495.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/ieih0he/five_nights_at_freddy_s_2020_game.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/gihm0id/36352935840.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470231/normal_5fee74d326340.pdfIn PDF document text
    • https://cdn.sqhk.co/xekowodu/hghgpJP/farm_animal_line_drawings.pdfIn PDF document text
    • https://cdn.sqhk.co/tinawegu/jdphedn/groupon_merchant_support_phone_number_uk.pdfIn PDF document text
    • https://babaxumo.weebly.com/uploads/1/3/4/3/134379683/lufumejuwiviju-nugowojokune-patesigowet-kadajejimu.pdfIn PDF document text
    • https://ziluxokoker.weebly.com/uploads/1/3/4/3/134392919/19ee496.pdfIn PDF document text
    • https://cdn.sqhk.co/fekesolip/jdbjhT0/78027033899.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370530/normal_5ffcb63f8b89a.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/D5ngdjb/grand_theft_auto_vice_city_ps2.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/dhhhiid/65646392331.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/XC52SjG/nekofofajesezi.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/Fjhifhd/suragakone.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/eeghagj/97559729735.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 5128 bytes
SHA-256: 7ed3f5adf20a1485a61a0c193bd5c147938755d06295019a65fc115adc2d4ce4
font_01_sfnt_off00010d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D49 10168 bytes
SHA-256: 60d0b7bbc8dffdb8833a6a0ce78d8849e824df8e471a9ccb9c5d4b4febd2b4c9

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