Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bdf13c06c7b285…

MALICIOUS

PDF

127.4 KB Created: 2021-03-21 00:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7b49f4cdd5a153f355075dd7af2afd68 SHA-1: 1214b389a86eaa42a4b96392be68e8d02e62d905 SHA-256: 31bdf13c06c7b2851f4d3e720185c6c332900f874de4cafd7ff95647393697f7
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://kuzutuzo.ru/strik?utm_term=forensic+psychology+pdf+free+download PDF link annotation
    • http://mobile-media.moscow/nfl_injury_report_saints6dh3j.pdfIn PDF document text
    • http://metiwizonud.getenjoyment.net/wotip.pdfIn PDF document text
    • http://tur8osale.site/wedding_salon_game_free_download_full_version7p0qz.pdfIn PDF document text
    • http://santand-es.com/57084772958lffl.pdfIn PDF document text
    • http://erogan-columbia.site/what_should_my_humidifier_be_set_atvod11.pdfIn PDF document text
    • http://7lessons.website/raymond_queneau_exercices_de_style71dj3.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/fz_meter_cable_price.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/aprender_ingles_rpido.pdfIn PDF document text
    • http://my-favshopd.online/how_many_sweet_potatoes_is_3_poundshpnry.pdfIn PDF document text
    • http://halfraire.xyz/ders_ii_gzlem_formumildh.pdfIn PDF document text
    • http://wuvutax.iblogger.org/kivuxobelaxem.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/72203306401.pdfIn PDF document text
    • http://instasavephoto.com/cisco_ea4500_driver_downloadnekvj.pdfIn PDF document text
    • http://xozonline.ru/xizadotisavenegeguta1dtny.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botalibinizor.rf.gd/madumavil.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/stihl_hs80_hedge_trimmer_review.pdfIn PDF document text
    • http://mivajale.rf.gd/bodyweight_workout_for_chest_and_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c105822-e450-4a35-ad68-e326649a980b/17925812750.pdfIn PDF document text
    • http://vatamutotomo.epizy.com/pubetegubefamagixobisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faeafde6-e66f-40fc-be3e-5186e339e456/is_panda_express_teriyaki_chicken_keto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad3f537-46ac-4b91-bdb3-040e30ef53e8/how_to_start_troy_bilt_squall_210.pdfIn PDF document text
    • http://nujafosedoke.epizy.com/bloodlines_2_richelle_mead.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8A7 5568 bytes
SHA-256: e3dce95ee681ba5b94fa870d9717e24572c96772040be696829cb2970ec27dd8
font_01_sfnt_off0001cbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBB0 10688 bytes
SHA-256: 867d8d66709ee0f4651ba6c2c684c25b9365a7f9a10149abf7683fb4a4d9c3d8

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