Malicious PDF — malware analysis report

Static analysis result for SHA-256 6092f1ab19f54a07…

MALICIOUS

PDF

84.3 KB Created: 2021-03-17 03:33:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 957f05293c16906e657a041bbbbe5ae2 SHA-1: ddf98d1bbcf85ee7a7de9fcb2389135e84971a19 SHA-256: 6092f1ab19f54a0735066ff031cd6a0aeade957c236214444411908ffd8e8776
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://golowaki.ru/123?utm_term=firebase+cloud+messaging+android+tutorial+2019 PDF link annotation
    • http://kujotisokuvo.iblogger.org/18340811498.pdfIn PDF document text
    • http://about-central.com/minecraft_0.15.0_apk_download_freeugapf.pdfIn PDF document text
    • http://classkaod.ru/83754957978vr8yy.pdfIn PDF document text
    • http://lawobusupovapuv.22web.org/42157731868.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/v2490_foodsaver_manual.pdfIn PDF document text
    • http://korecos.ru/playstation_emulator_for_android_tvnolr1.pdfIn PDF document text
    • http://maska-respirator.shop/hockey_training_programme6kwsd.pdfIn PDF document text
    • http://osmosiotzs.fun/woxamulaxozulewoxurij4h6wy.pdfIn PDF document text
    • http://fbcopyright-center.com/69911098765hof4f.pdfIn PDF document text
    • http://unreguezff.rest/mr_bean_kung_fu_movie_namebvr7s.pdfIn PDF document text
    • http://amorexpo.com/22959205384yax7m.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/7f539aa2-93a4-493a-a660-b59a75cd7796/97187869078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64cb66b8-cd3d-42bc-8a40-fa7c5b9c37b9/24974090777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b58c04b-e335-4744-b9de-81cadf316e05/how_to_put_captions_on_pictures_in_microsoft_word_2010.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/sigawubuludot.pdfIn PDF document text
    • http://pelubameta.epizy.com/xomitumudupuvuzolip.pdfIn PDF document text
    • http://bobiwusej.rf.gd/cavatina_piano_sheet_music.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_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 5836 bytes
SHA-256: 7d2e5bc01aa77f46fe4b5242157f1be845d3444dab6ac40eb5b50471194ad6a5
font_01_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 11596 bytes
SHA-256: 4badd342890d9f2f09524368ff1f222504d356d87746a67139565bc26dff9e74