Malicious PDF — malware analysis report

Static analysis result for SHA-256 888ef44c46e15a39…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 15:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: da1085730897a39d8391c0b0043c44ab SHA-1: 26b2adc28b1d28632c80cbaecb393cb6ac76d2f9 SHA-256: 888ef44c46e15a390845df1428ef33555c7da967ea2a7e0da8f75c7ed71149c0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm or phishing operation. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=rainbow+6+quarantine+release+date PDF link annotation
    • http://kukilafixe.22web.org/94618725627.pdfIn PDF document text
    • http://fofafik.iblogger.org/waruxepodekora.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/6637524964.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/paint_grip_steel_sheet.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_c997057fe0b24f7f8cecc98b48a26430.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/75657589603.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/graphic_designer_cv.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/lizijoruvowiwu.pdfIn PDF document text
    • http://newiroxupamorik.rf.gd/android_anim_alpha_xml.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/how_to_use_voice_command_on_roku_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/pisesuzolumevov.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/52285784780.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/82914062362.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_b0068c746c454ee2905bb0f7ec2164b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewibim/bejawada_kanaka_durgamma_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/simpledateformat_trong_java.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/42711699024.pdfIn PDF document text
    • http://merilejefug.rf.gd/64326838135.pdfIn PDF document text
    • http://nosunep.epizy.com/change_advisory_board_charter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/lotutezefadapajusotu.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_9e3bc6e64e45437692014e601a27331b.pdf?index=trueIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_265a7014e3354da69cdb6c79c0f8ef89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/nawetogakerew.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/baghban_songs_mp4.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_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 5336 bytes
SHA-256: 9eea0f3ed9a2fe1ac1c61671b130ec6b52df86a83c50f0c97830962e9d45a3db
font_01_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 10520 bytes
SHA-256: d2051bec133254c548b6f7f7d8b208cc74bf37379c78a0083a39521a2567ebea

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