Malicious PDF — malware analysis report

Static analysis result for SHA-256 77290cbfac5ac089…

MALICIOUS

PDF

67.9 KB Created: 2021-02-02 13:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 77e38c6960d99df504ede9f2e6fe5933 SHA-1: 475b65b5fc7854047d4bde22a17528ff18046066 SHA-256: 77290cbfac5ac0893c5582dfedf0299a37ece47da1cd83d0bef6101552dff907
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external links, including one pointing to a potential link farm, suggesting an attempt to redirect users to malicious content. The document body, though partially corrupted, indicates a theme of educational worksheets, which is a common pretext for such attacks.

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://jottigo.ru/aws?utm_term=adding+and+subtracting+polynomials+worksheet+with+examples PDF link annotation
    • https://cdn.sqhk.co/tigixexaxi/r5Wjchd/3244822672.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/bimewukat-soledemisadoj.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/hgfkia8/jepifobi.pdfIn PDF document text
    • http://fosijez.22web.org/consumer_reports_used_cars_buying_guide_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/lamijaluxeso/iJhcoZn/budojoralodijesovo.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/hijcPcG/ratage.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/ijSqNU4/kerinujidejexasebud.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/fhhijhj/contemporary_christian_songs_about_prayer.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/7jdnjii/45930677768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nefaped.epizy.com/jio_phone_in_play_store_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/vosumapadoti.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/lafawenuzuboxafamowap.pdfIn PDF document text
    • http://nupadamemal.epizy.com/banner_saga_2_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/primark_double_fitted_sheet_size.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/injury_report_packers.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/job_story_template.pdfIn PDF document text
    • http://xafonabikox.rf.gd/d_d_barbarian_5e.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_off0000c94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94F 5940 bytes
SHA-256: 05b70e8a520560ea676b0523a0bb5439613be6c15797b74e847644db3e8423c0
font_01_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 10684 bytes
SHA-256: 814ccf1795b5a2e0687cd5c72c84e8cf6f7189861524578792e2266ed6d1c074

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