Malicious PDF — malware analysis report

Static analysis result for SHA-256 3418e49854aecec4…

MALICIOUS

PDF

70.9 KB Created: 2021-02-15 16:14:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7833244b639c89898b21b6df16b6e7e7 SHA-1: 6b01c03e108771b1d6b9c104591415490e56bc9b SHA-256: 3418e49854aecec4dbb65c36ee4e7ea8d654fb8b6cbd76b8a185ab33ec557eb0
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily corrupted, contains fragments related to driver downloads, aligning with the phishing lure.

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://leonvi.ru/123?utm_term=hp+invent+audio+drivers+free+download+for+windows+7 PDF link annotation
    • http://money-team.site/dazatikijodopahuts1.pdfIn PDF document text
    • http://im-marceting.site/free_game_of_thrones_season_8_downlob77tf.pdfIn PDF document text
    • http://maska-respirator.shop/fobitoniwk327j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451023/normal_600c248cc512c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_601d5aefe1638.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5ff55b331d67b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426690/normal_6001f52675cfb.pdfIn PDF document text
    • http://politach.com/bodo_christmas_song_2018l52zx.pdfIn PDF document text
    • http://kulinar2020.site/leriwigijijeresilejojokexxfwz.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/sql_formatter_ssms.pdfIn PDF document text
    • http://ribupisid.22web.org/intermediate_english_test_with_answers_doc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_5fd79229b86ae.pdfIn PDF document text
    • http://nowofuguvinidaw.iblogger.org/best_video_er_for_android_tablet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozadowosib.rf.gd/az_video_recorder_mod_apk.pdfIn PDF document text
    • http://wolasuwalijite.epizy.com/amrit_ki_barse_badariya_ringtone.pdfIn PDF document text
    • http://numadipabep.epizy.com/kewexe.pdfIn PDF document text
    • http://vejebuta.rf.gd/75230573501.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_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 5228 bytes
SHA-256: bfd22fc28a817a1707734b57f0f9a5c8a36b56cea28db983ca44bbf390203493
font_01_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 9832 bytes
SHA-256: ea2d73896a7a73d2fa137df448fb597193f7b77b2430c1999238fcf3655b7291

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