Malicious PDF — malware analysis report

Static analysis result for SHA-256 99de12f0aadbfc5c…

MALICIOUS

PDF

90.0 KB Created: 2021-04-04 20:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3d09ec8b20ba128c46c86c884710f76c SHA-1: b64d35e17dddc1f87100dfe70b454d7af61387bc SHA-256: 99de12f0aadbfc5c0a908c33fb779eca9c533961c53b1d103440d6e61fc7b439
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'druttle.ru', which is likely a malicious domain used to host or redirect to a secondary payload. The document body, though heavily obfuscated, suggests a lure related to educational content, aligning with common phishing tactics.

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 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://druttle.ru/123?utm_term=geometry+g+reflections+worksheet+1+answer+key PDF link annotation
    • http://trelon.fun/an_unexpected_internal_error_has_occq9buv.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/Hhf1b32/ledeg.pdfIn PDF document text
    • http://misstourist.info/jaws_bookzwehq.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/87628541809.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/k9hija1/bass_pro_shop_black_friday_sale_2019_ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44e4e56-7c66-48cc-9588-3dee2c48c9d6/is_procreate_still_on_the_app_store.pdfIn PDF document text
    • http://zugagib.atwebpages.com/oxford_advanced_learner_dictionary_12th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/873bcc1c-646f-461a-bbec-95da67f9f150/dura_ace_di2_battery_charger_instructions.pdfIn PDF document text
    • http://vawofirulev.myartsonline.com/guy_de_maupassant_boule_de_suif.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/gabriel_s_oboe_for_clarinet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/arthroscopy_adalah.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/tizilegigotuvuvusam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7f0dab-1b3c-411e-9867-5a412a279f11/gabujeneremiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c3f2eb-10f1-48be-aa2c-b9b4e6c4eb1d/49878101359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d062ac-de62-4aa7-aeba-ddf9c6b096e6/bajagowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286dc283-4729-4f60-a31e-7b616ad432d5/is_it_ok_to_drink_chrysanthemum_tea_everyday.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 5636 bytes
SHA-256: f5d8c997183b64ff67297badd38433d1893d1718f64ad2027ade6031d952584e
font_01_sfnt_off00013187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 12140 bytes
SHA-256: de744da1656e481209cdf8eabb02ce4cb0d5eef079cfe1fed54496d2fe531dde

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