Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d77efcd890eebe…

MALICIOUS

PDF

75.4 KB Created: 2021-03-18 20:09:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7779173990da67577297618258a5a6fb SHA-1: 581bf7b81fca457fcd12be3db9aef1752f1a4164 SHA-256: 76d77efcd890eebe1b9bc2ba989fcffece7a1291d6cb380ec66ab698f60a27e1
156 Risk Score

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 0.9995

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://kuzutuzo.ru/strik?utm_term=how+to+calculate+npv+in+ba+ii+plus PDF link annotation
    • http://reawolt.online/86019158925a6jhn.pdfIn PDF document text
    • http://zozemumole.iblogger.org/iphone_or_android_phone_which_is_better.pdfIn PDF document text
    • http://cookwellbakewell.com/rex-c100_manual_portuguesbrw9s.pdfIn PDF document text
    • http://scriptbook.xyz/tumevisixuvazilisujenu1nwi1.pdfIn PDF document text
    • http://canlisohbetim.net/how_to_win_cricket_betting_tipsnnib3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_8c16cf4e3d7745779269cfb7050bdc07.pdf?index=trueIn PDF document text
    • http://wexejof.epizy.com/frozen_movie_in_tamil.pdfIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_0578ac09dda44f978a7a23e495d04a55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/68385300481.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/cv_template_latex_mathematics.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_9b1f48b0df4f45579590d4e32f91e641.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozore/the_game_cast_season_3_episode_19.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/69378360428.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_850174cfefab4143ad625f2a10c279df.pdf?index=trueIn PDF document text
    • http://mivurekas.epizy.com/62738881703.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_47dded4caf9e44e18a96fc62bac7b2f0.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_34aabf068e344c1f9ca051161b03ccd3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/what_type_of_writing_is_an_autobiography.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_6abaa77d3b4d4e5a802fdf6104dc594d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/kanekakawujodifopudi.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_e86310516bb548bab96a42e43bbddc3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/telejojideweva.pdfIn 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_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 5084 bytes
SHA-256: 97a18c0933f52ff6f9f0b849c46d034894f26ab88c21bd47f9fcb170fd7550a2
font_01_sfnt_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 11692 bytes
SHA-256: c27afb9436e2eaf21cd8ccfe742e6531ca61cc292722cc0593a832d1a02a510d

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