Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a6576c24145218…

MALICIOUS

PDF

79.0 KB Created: 2021-01-18 09:26:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9b45f8c5ac4f49f92e7f1e71f4a4c0c9 SHA-1: a5364b03e7f566006a20826328b23c595f7b8389 SHA-256: 50a6576c2414521855593826752867a98b0963b872d7740b6479e1a9775bced9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are part of a link farm, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a 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://trafficel.ru/wb?keyword=labrador%20puppy%20farm%20near%20me PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5ff0d9fccce0b.pdfIn PDF document text
    • https://gupupekulumo.weebly.com/uploads/1/3/4/1/134108922/novalapokerig_zubinatud_zexexo_baruzibotasubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f87be5389000.pdfIn PDF document text
    • https://site-1257147.mozfiles.com/files/1257147/music_box_dancer_sheet_music_piano.pdfIn PDF document text
    • https://site-1175458.mozfiles.com/files/1175458/vigafomitol.pdfIn PDF document text
    • https://rajuputodetu.weebly.com/uploads/1/3/4/6/134682309/a11ae033.pdfIn PDF document text
    • https://site-1174138.mozfiles.com/files/1174138/where_is_device_care_on_my_samsung_tablet.pdfIn PDF document text
    • https://site-1194964.mozfiles.com/files/1194964/49270708197.pdfIn PDF document text
    • https://site-1176492.mozfiles.com/files/1176492/84764632075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fa6a27672978.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/waves_tune_review.pdfIn PDF document text
    • https://site-1179199.mozfiles.com/files/1179199/lunoweg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rifovedukuj.epizy.com/chlorine_water_safety_data_sheet.pdfIn PDF document text
    • http://mavipob.epizy.com/84218977113.pdfIn PDF document text
    • http://nulesuli.epizy.com/bibtex_format_to.pdfIn PDF document text
    • http://robowogutalopet.epizy.com/xiaomi_mi_a2_lite_android_10.pdfIn PDF document text
    • http://pinezininefos.epizy.com/guided_access_won_t_turn_off.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 4912 bytes
SHA-256: a5bd38b662aaeadd3e858cb74befc513d8772b43df1d61a22ee09cd5c2b155fe
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 10736 bytes
SHA-256: 7e35881ff05c785ef469bd6a1e602710fd3a4b7ed1c8c54c4d02717cb35354d8
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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