Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed121f85a9650818…

MALICIOUS

PDF

96.2 KB Created: 2021-02-17 16:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 111978999a30f4e54e366324ccbbac70 SHA-1: dc3ea7ad82a47ef61d19cdc618b97773e9adda6d SHA-256: ed121f85a9650818334aedb3936a856e301b30d8b35e54ff31d7a616b76507ed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=how+to+prove+that+chlorophyll+is+essential+for+photosynthesis PDF link annotation
    • http://im-marceting.site/there_is_there_are_exercises_perfectw3bnx.pdfIn PDF document text
    • https://sipebiwamedewor.weebly.com/uploads/1/3/4/7/134707389/bugukifu.pdfIn PDF document text
    • http://makeyourself.xyz/hrm_internship_interview_questions_and_answers44hxi.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/b6121f03cc7e141.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/2550194.pdfIn PDF document text
    • http://nout-prodat.site/497088468503kfq7.pdfIn PDF document text
    • https://memuvarava.weebly.com/uploads/1/3/1/3/131384606/vozis.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/jewunokepivobowemebo.pdfIn PDF document text
    • http://physcoo.com/simatadoja2hpu.pdfIn PDF document text
    • https://rupimobo.weebly.com/uploads/1/3/4/8/134891389/f7c449d13f6f7.pdfIn PDF document text
    • https://rojurunonujimos.weebly.com/uploads/1/3/5/3/135325454/foxileba.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/daraniwekamidir/27821705659.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/nikegojitagudekinezigono.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/abbyy_finereader_11_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/comment_assembler_2_en_1_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/ssms_format_sql.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/paligili.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_off00013b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B73 5316 bytes
SHA-256: 8037f0342b722bbd2e3f7840c47bc260bc0a4c1b3f96a9582cd75fe8dca3f79d
font_01_sfnt_off00014da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA0 10976 bytes
SHA-256: ce0bb90e2e0a718cb68bd6ea71b5c87ff5b57326e935ca9faa2549fa730c83ae

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