Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3ccd9f47ee2d0f…

MALICIOUS

PDF

74.1 KB Created: 2021-02-24 01:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b0c5dcf195adc7df43d43941c2cf7a56 SHA-1: 3e42d871c9f4721e81ad4cc27dcb634d7f965e75 SHA-256: 8d3ccd9f47ee2d0f8c1fe1e24dbc076f4916f426248435822560f17a1606707e
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified by heuristics as a link farm and flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Diy rifle cleaning stand', which is likely a pretext to encourage clicks on the malicious URL. No scripts were extracted, but the PDF structure and URL reputation strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=diy+rifle+cleaning+stand PDF link annotation
    • http://demaxapap.22web.org/poker_rules_2_pair_kicker.pdfIn PDF document text
    • https://rovorakule.weebly.com/uploads/1/3/4/7/134774255/9363640.pdfIn PDF document text
    • https://kefavobora.weebly.com/uploads/1/3/6/0/136010588/giforiniti.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/PihXsSm/talking_tom_gold_run_game_online_download_free.pdfIn PDF document text
    • https://bukudemedu.weebly.com/uploads/1/3/1/4/131483547/1507665.pdfIn PDF document text
    • https://cdn.sqhk.co/kufusivekogo/Jpvhggd/jutusukatokilezowizipuz.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/jbgdyjf/laser_distance_meter_phone_app.pdfIn PDF document text
    • https://cdn.sqhk.co/mudaxomemut/i0iijcv/rocky_balboa_music_remix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/windows_10_activator_64_bit_kmspico.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/cash_app_apk_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/what_was_the_february_revolution_1917.pdfIn PDF document text
    • http://fipaliwabalutu.rf.gd/morule.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/berkshire_hathaway_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/engineering_guide_wow_3._3._5.pdfIn PDF document text
    • http://jerokiguwipifo.rf.gd/77085540975.pdfIn PDF document text
    • http://gujusama.rf.gd/business_card_mockup_file.pdfIn PDF document text
    • http://ximogubofew.epizy.com/felanezitemusejixo.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_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 5288 bytes
SHA-256: bad3610fabc3b5ecc12918e551873c4e920a27740c8959dcb877f2e65fae5774
font_01_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 10700 bytes
SHA-256: 618ebdf9fd0af6436a53ce4c816c58d9de1d13b303eae4bf642690171317f869

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