Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9d094a4dc3177f…

MALICIOUS

PDF

67.7 KB Created: 2021-03-14 01:55:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0fa8e255e9b574eb837bccaf4bb46a68 SHA-1: ffd1eb2b3702a2094f37b0fba1bcbe0fc2433d60 SHA-256: 4f9d094a4dc3177f28d39f62e8e49485ad757afd9bd6e08be5fb9f987b64df3d
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 0.9992

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=molar+mass+and+percent+composition+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/nimabugokofa/hchGLha/56706714362.pdfIn PDF document text
    • https://cdn.sqhk.co/besimiwi/jjbhhb9/79159429091.pdfIn PDF document text
    • http://esmoney.site/982915142796zryu.pdfIn PDF document text
    • http://cosmicgig.com/how_to_reset_yamaha_htr_6130nbwt0.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/Uhhcw7H/hephzibah_reversible_sleeper_sectional.pdfIn PDF document text
    • http://bigno.space/zexejufiwf6zk.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/gc4E5he/43758610746.pdfIn PDF document text
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/zapiri.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/woxemi.pdfIn PDF document text
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/muvisefodari.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/padadijakod.pdfIn PDF document text
    • https://cdn.sqhk.co/retuwami/bijigii/gikumowokepuwejiba.pdfIn PDF document text
    • https://cdn.sqhk.co/luzigagoguna/hcV3jgN/best_captions_for_uploading_pics_on_fb.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/jthfiiA/16856833662.pdfIn PDF document text
    • https://rosatavur.weebly.com/uploads/1/3/2/6/132695818/6700496.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/jixeremipet/vovaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/travel_website_templates_psd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/biriyani_movie_hd_video_songs.pdfIn PDF document text
    • http://zatopava.epizy.com/49342630314.pdfIn PDF document text
    • http://repoguter.epizy.com/which_samsonite_luggage_is_the_best.pdfIn PDF document text
    • http://gezujoju.epizy.com/codycross_answers_group_146_puzzle_1.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/apache_cloudstack_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/nawusemomasijopixezusad.pdfIn PDF document text
    • http://falivodekolulo.epizy.com/fasujinopunepem.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_off0000cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 5576 bytes
SHA-256: d4300a8a8f58bdd69b908a2466a158023df5b45173637d1d61991380dac2860a
font_01_sfnt_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 9792 bytes
SHA-256: 6ed4dc5f6f9f2455be0193685b3863fb5936321aed80f0d4ee5c69077ebe7b01

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