Malicious PDF — malware analysis report

Static analysis result for SHA-256 9338715965d9ff4c…

MALICIOUS

PDF

68.5 KB Created: 2021-02-13 06:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 998f21d27c01f919e84a020e3b76805d SHA-1: 7a846e2de65f73656a0840aef9b1b9bbe2363bc5 SHA-256: 9338715965d9ff4cbf9a6d8823c4c18ff86577aeba6b3a4e93414a28f13f46aa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to a 'midsegment theorem worksheet', which is likely a lure to disguise the malicious intent.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=midsegment+theorem+worksheet+use+the+diagram+of+abc PDF link annotation
    • http://ryduslim.website/levumeamlpl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467593/normal_5fc5bc1047eac.pdfIn PDF document text
    • http://besuxiju.22web.org/67051672171.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444374/normal_5ff1dc58ac4a0.pdfIn PDF document text
    • http://francobusiness.com/france_application_form_for_schengen_visa9cxhj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5ff5209049b5c.pdfIn PDF document text
    • http://loveantravel.xyz/survival_battleground_free_fire_battle_royalecs7kc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/levumoduf/meerutiya_gangster_movie_mp4.pdfIn PDF document text
    • http://xonukekavufimil.epizy.com/hospital_infection_control_risk_assessment_template.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/44441292477.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/employer_rescind_offer_letter_template.pdfIn PDF document text
    • http://tuvakaj.epizy.com/free_mailchimp_templates_envato.pdfIn PDF document text
    • http://gufesabil.rf.gd/aahat_serial_music.pdfIn PDF document text
    • http://ketugida.rf.gd/luw_barcode_software.pdfIn PDF document text
    • http://rewifavad.epizy.com/zexida.pdfIn PDF document text
    • http://pulawev.epizy.com/connectwise_university_report_writer.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/my_school_kindergarten_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC229 5584 bytes
SHA-256: 0eba3fe32725dec3a251566f39882b7d0c6a026d0ecc42fc8b91219631c38da0
font_01_sfnt_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 9704 bytes
SHA-256: da055f61cc51995945ddd02ca47dba919eb716825d126e3409fda401bb420080
font_02_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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