Malicious PDF — malware analysis report

Static analysis result for SHA-256 217dc0a401dbb67e…

MALICIOUS

PDF

69.7 KB Created: 2021-04-02 15:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5d9f663089c95f475c71e6a0f485f752 SHA-1: 5327a68f55fc61c94ee3c7ed58b5a1b305cca189 SHA-256: 217dc0a401dbb67e2f8ff1e80774c33f6362419f60231697a0c7699b06889d43
126 Risk Score

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-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://dafemum.ru/wix?keyword=ramona+pony+baseball+fields+address PDF link annotation
    • http://greatholl.com/introduction_to_real_analysis_robert_g_bartle_solutionsxvoj7.pdfIn PDF document text
    • http://icub.tech/davinci_kalani_4-in-1_convertible_mini_crib_greyfle5g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425772/normal_5ff572acc7f30.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/c1ChfQa/bakevikufoxizase.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/MheiWlJ/extreme_car_driving_simulator_2015.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/ehdvibd/7719130162.pdfIn PDF document text
    • https://cdn.sqhk.co/rolaravez/jhfcFig/aumsville_ponds_fishing_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493600/normal_5ff71a4b2eae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_6035e1efe593a.pdfIn PDF document text
    • http://wiinorama.fun/bengali_to_english_translation_app8g04f.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/TuhhjdK/fortnite_nintendo_switch_tips_and_tricks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_5fdb65d38f311.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/julaxel/darth_bane_rule_of_two_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/sanaxugatapizesole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8583171-d354-47dc-93c4-1fc58e094a32/rca_led55c55r120q_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9d838c-d14b-45db-b2f0-f8c9417847da/sozut.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/7796321901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a6b52b-d012-43e6-866d-05c4f7937707/17220209629.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_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 5436 bytes
SHA-256: 32be205a3349cdd1ea24928e377a6756c168be95f7335c99d5f52dc34d7682f8
font_01_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 11112 bytes
SHA-256: 6ea3309420daa805eb820d1939493c34f0e3509801529e7d0e9220a1fc5fafa0