Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43490ac3930e850…

MALICIOUS

PDF

72.5 KB Created: 2021-02-16 02:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 046f61cf7af75efb0f7d747bcf4715cd SHA-1: 9a75fe823e1e5e8402ac111bec37e06b946682ff SHA-256: e43490ac3930e85092f0f995d8d512968d46a941a4efcbb2f94d21151def5c5e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as https://jottigo.ru/wix?keyword=evaluating+numerical+expressions+worksheet+pdf, suggest a phishing or malware distribution attempt by luring users to external sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=evaluating+numerical+expressions+worksheet+pdf PDF link annotation
    • http://badgesverified.com/best_board_games_2020_boardgamegeekzkpq8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460457/normal_60198ad11b44b.pdfIn PDF document text
    • http://geniusenglish.space/398585914543nerx.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/e34f38027.pdfIn PDF document text
    • http://nominasacra.ru/rogaxokekevodabevufemases7u5yg.pdfIn PDF document text
    • http://fubesewokelo.22web.org/modern_calligraphy_guide_sheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387566/normal_6001723569a33.pdfIn PDF document text
    • http://stylecurtains.com/9848817976tmci6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_60160508aece8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokinurerapim.rf.gd/bosikizepolakeje.pdfIn PDF document text
    • http://sekamot.epizy.com/choosing_acoustic_guitar_strings_guide.pdfIn PDF document text
    • http://rutenodisekorin.rf.gd/travel_itinerary_planner_template_excel.pdfIn PDF document text
    • http://vorawaforase.epizy.com/happy_birthday_greeting_song_free.pdfIn PDF document text
    • http://rusowemiwa.rf.gd/kowok.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/xaxorutujixilepoda.pdfIn PDF document text
    • http://danetuxu.rf.gd/poragivosezisanoke.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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 5808 bytes
SHA-256: a30a988371e86ae26a413c17569f26e55d03a9779a15ecb325edd80a2fc57dc3
font_01_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 10780 bytes
SHA-256: 7a9cc67483d8e1d20a8a1b0285df2324e4cbbcd7d46b5e7ebf56e6c143f93a77

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