Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8a792a1b82b520…

MALICIOUS

PDF

73.4 KB Created: 2021-03-08 03:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4701a04fdcd4b15e1e8a833f2aa29b5a SHA-1: 4759937986f060ccc86d131b5c3f69758c629f11 SHA-256: eb8a792a1b82b520a41c9de33a2a269489fb9a234b6356a661be32390060dedf
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, https://vilenefex.ru/wb?keyword=the%20collector%20book%20trailer%20scholastic, pointing to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host multiple links on disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted, but the overall structure and URL findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/wb?keyword=the%20collector%20book%20trailer%20scholastic PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476421/normal_5fe28ebf75863.pdfIn PDF document text
    • http://yourlivehelp.com/duvakupofanubelalowejycsb8.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/82394348864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_6025881732389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365649/normal_5fe600c277325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385427/normal_5ff2bf462831f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_603e67985092c.pdfIn PDF document text
    • http://golulim.iblogger.org/takeuchi_tl12_operators_manual.pdfIn PDF document text
    • http://matrixbicycles.com/junudevinulareketixordqaea.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/471bfaf2-7702-46bb-8e6d-5819dbc1aaec/mary_poppins_lyrics_supercalifragilisticexpialidocious_backwards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7e8731-196e-487f-bd0f-d94766de0b6c/nizanizedovanijeze.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/21568229420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc7bb845-2310-4e56-9e04-86f9ef04fd0b/sharp_alarm_clock_manual_walmart.pdfIn PDF document text
    • http://luxetejafolakem.rf.gd/causes_of_world_war_1_document_based_questions_answer_key.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/how_do_i_change_the_time_on_vivofit_3.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/how_navy_seals_lead_and_win.pdfIn PDF document text
    • http://votasaze.rf.gd/ccna_v6_chapter_4_exam_answers_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af49b037-1254-4963-880b-93c633228d9b/how_to_identify_vw_beetle_transmission.pdfIn PDF document text
    • http://nawezurik.rf.gd/think_central_science_fusion_grade_7.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_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 5040 bytes
SHA-256: 113873fbb7cf7de5275bfaa09d5ccd7ae0127553cc33ef380927551e54193a5a
font_01_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 11472 bytes
SHA-256: 5d361d4cbca42a02e209a509dd1a8d677641f5f129a9e982ed5a64f398e1deda

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