Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c02bd530cd437a…

MALICIOUS

PDF

75.8 KB Created: 2021-01-18 10:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aa49b302a6918fb13c613af39be09d28 SHA-1: 650b58102ad7a3891e44bdb5f45fcb561794ad30 SHA-256: 41c02bd530cd437a5dee26554913bbc3041a4ac8aabb9d1aa0d1603007e72590
192 Risk Score

Malware Insights

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

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/123?utm_term=grand+theft+auto+5+apk+download+apkhere In PDF document text
    • https://dubarepexax.weebly.com/uploads/1/3/4/5/134586846/monapunukuwirexome.pdfIn PDF document text
    • https://site-1211548.mozfiles.com/files/1211548/42747734588.pdfIn PDF document text
    • https://zolagefotatol.weebly.com/uploads/1/3/4/7/134709454/gefatadukutuvi_tixis.pdfIn PDF document text
    • http://xiwasaruv.66ghz.com/case_study_report_example_nursing.pdfIn PDF document text
    • https://site-1176519.mozfiles.com/files/1176519/asge_guidelines_esophageal_varices.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/19e812911.pdfIn PDF document text
    • https://site-1168030.mozfiles.com/files/1168030/pokemon_trainer_club_unable_to_authenticate_android.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/cd424.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/hajaggD/bad_piggies_hd_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gobavata/3Bfchha/strategy_process_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazusoketa.epizy.com/91934748552.pdfIn PDF document text
    • http://mudalulox.epizy.com/vamuroneti.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/iiser_pune_summer_internship_2019_application_form.pdfIn PDF document text
    • http://fuvovidesom.epizy.com/canberra_raiders_song.pdfIn PDF document text
    • http://fuwuwiri.rf.gd/vimimafixumajogevizizuxu.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_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 5264 bytes
SHA-256: 2819acaf572a3e4ee23047a015229663c99b33bfa902de27fbf17cb1733db5cb
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10584 bytes
SHA-256: ec7835cece737cefc0aad46d09a197851adc872cba9b7f9bb248a7401daf6b85

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