Malicious PDF — malware analysis report

Static analysis result for SHA-256 877e37120cbac45e…

MALICIOUS

PDF

71.4 KB Created: 2021-02-13 14:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c1270dd6f3ce5761da98fd85e42ee9fd SHA-1: 1579bd94430e3a5e97b853eaaa43aba4059f1870 SHA-256: 877e37120cbac45e43a557602f8de88cf1e5b05e8ab5b17c7505b0705464fdde
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 0.9998

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://druttle.ru/wix?keyword=esperanza+rising+study+guide+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/wumidimux/vTggghd/83420358393.pdfIn PDF document text
    • http://petajofap.22web.org/3800323955.pdfIn PDF document text
    • https://xifofenanupov.weebly.com/uploads/1/3/4/8/134857182/3b67b.pdfIn PDF document text
    • http://difavusimope.iblogger.org/canadian_girl_guide_cookies_vegan.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/shjieje/wood_project_ideas_for_high_school.pdfIn PDF document text
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/82f944282b6.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/wusopore-bedufine-xatagod.pdfIn PDF document text
    • http://fokuguxeni.iblogger.org/22422787416.pdfIn PDF document text
    • https://nurinakeviwiket.weebly.com/uploads/1/3/1/4/131407921/kawajegod-dilugafez-nupatadot-rulafebu.pdfIn PDF document text
    • https://jubewujug.weebly.com/uploads/1/3/4/6/134653216/gemuvotasilulo.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/gozifep/changes_in_matter_worksheet_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/ascendant_movie_mp4.pdfIn PDF document text
    • http://dudulexo.epizy.com/9909825585.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/kojapurebagevesusogaki.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/que_significa_languidecer_rae.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/estudios_epidemiologicos_experimentales.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/41447375364.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/javotudeji.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/14149700658.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_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 5424 bytes
SHA-256: d503dfab034b273b1e83ce9ddb1cb5f412224ed21a0ab892b3341b1850a8bea9
font_01_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 10300 bytes
SHA-256: 3ed74e788744182a8aa8ea07a9b078b4794166ed52422e4f002d2ec5679ccbf4

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