Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8d002e890c97a7…

MALICIOUS

PDF

81.5 KB Created: 2021-04-03 04:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d53226372b97e807db343313a51e3abd SHA-1: 7a3c13fb8ceae574dc12491c1933af05fa146d44 SHA-256: 3d8d002e890c97a788d835ebc5ebab8cf0109677f6c41c6d9be0c3a6f90cb2c6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/123?utm_term=army+combat+uniform+2019 PDF link annotation
    • http://brosbass.com/zenonia_4_ranger_buildup7gy.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/cub_scouts_leader_book.pdfIn PDF document text
    • https://cdn.sqhk.co/zalopubid/hbspjhu/cnc_milling_programming_manual.pdfIn PDF document text
    • http://help-bluebadgecenter.com/71730177278ahg4g.pdfIn PDF document text
    • https://cdn.sqhk.co/puzusagilem/fgeijwW/weather_report_next_10_days_in_ambala.pdfIn PDF document text
    • http://wutugavefezaza.22web.org/buyer_s_guide_apple_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/oii28hi/walesonline_football_swansea.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/lghChch/blockbusters_online_pvp_shooter.pdfIn PDF document text
    • http://datingdate.site/hyperbole_and_a_half_book_summaryugw7u.pdfIn PDF document text
    • http://parkji5x.xyz/284123688630n9mz.pdfIn PDF document text
    • http://kijumubafenu.mypressonline.com/beyond_good_and_evil_cambridge.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/e49f77bc-e451-43b5-87e7-d8e2c87a27c0/95974940388.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/winston_churchill_speeches_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/oracle_sql_case_statement_in_where_clause_multiple_values.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/metoclopramide_davis_drug_guide.pdfIn PDF document text
    • http://fuvozakini.epizy.com/55514546916.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/nofakatekazakegewasa.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/91634159006.pdfIn PDF document text
    • http://bulojidaxuxuvod.rf.gd/detopakurubi.pdfIn PDF document text
    • http://zagupijalixi.myartsonline.com/42430898108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833d1d01-fa2d-48d7-82cc-830f451166a3/48656539074.pdfIn PDF document text
    • http://zepaxawom.rf.gd/arquetipos_hlio_couto.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/65701455220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebddb000-7594-4571-bd72-6479bb84d44e/kumegubusenebiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82cbf69-2cc4-48b8-87b0-dbb7d9b6d054/what_size_is_30_in_jeans_forever_21.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_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 5528 bytes
SHA-256: 3dae5bf6a717030829c7ce4925ae559306e44c9b1d67451a42f93499616b6e85
font_01_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 11156 bytes
SHA-256: 45410e8a809a589a2a269d9ba49d6287e39b25a99ccea825aa85bf84262a5c6a

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