Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bd7597319d4b80…

MALICIOUS

PDF

68.0 KB Created: 2021-03-04 22:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 20fcd3ccc8d69ec291689c9e47d1d642 SHA-1: 11d461d7f5c9db0bba621e0f8dd0c6ecc1bc986b SHA-256: c7bd7597319d4b80e70b2ec3b20bf72e1ea508d3a033cbaeb3330f672a0f3625
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/123?utm_term=ukulele+tabs+go+tell+it+on+the+mountain PDF link annotation
    • https://zumegopepotiko.weebly.com/uploads/1/3/1/3/131398003/9441083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481518/normal_5fe77a56059f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_603f0621c5655.pdfIn PDF document text
    • http://dududuw.mypressonline.com/how_to_program_logitech_harmony_520_remote.pdfIn PDF document text
    • https://modevibivuruwix.weebly.com/uploads/1/3/1/4/131406629/bonaxugonizorafu.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/topupemudifovetuzarig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5fd17d2abfc8a.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/direfizupukidewofavo.pdfIn PDF document text
    • http://shoop-fe.ru/pentair_fns_plus_60_how_much_deku6m3.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/que_significa_orando_en_el_espiritu_santo.pdfIn PDF document text
    • https://tezijiso.weebly.com/uploads/1/3/4/6/134690371/4152483.pdfIn PDF document text
    • http://xbet1.fun/how_many_50_shades_of_grey_movies_are_there_on_netflix45ch1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_602fa046eaa61.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/6293f13b-82d5-4bb8-bfa3-8cc0eb4b4e04/rimas_y_leyendas_de_becquer_el_monte_de_las_animas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18a6a9c-c316-44f1-9894-70b6bd613cfb/83096294948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81560c6d-faa4-434f-a996-e621e6231795/divaxukaraxuxubopebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406b8369-1a4a-4e67-8911-287294a4d669/77521026785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c21eb5-23e1-4720-8009-38976effeb3b/sears_craftsman_scroll_saw_manual.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_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 5200 bytes
SHA-256: eb4225b552ce86b313a00ecc5c69d1c6cec22ac6c8f3ff92a6cf308d131ff46a
font_01_sfnt_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 10380 bytes
SHA-256: 8ac0cef8d07688e81eb2e5c1eb95ca796cfd2bea86c3b90511ddf439ef940597

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