Malicious PDF — malware analysis report

Static analysis result for SHA-256 796b1bc6c272b920…

MALICIOUS

PDF

75.1 KB Created: 2021-03-31 17:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 65bfc32c54e1ae489ea7e855eab5f626 SHA-1: 1887de2fb4374e9f6e5f5582859dba0f7d0afa6d SHA-256: 796b1bc6c272b92020f4d230c72b6b4822e344d905a5bb15d9404bd4897675ac
166 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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://maypoin.ru/wix?keyword=stem+cell+worksheet PDF link annotation
    • https://cdn.sqhk.co/ranotigu/iageBJB/5959885950.pdfIn PDF document text
    • http://arbitestpark.xyz/carol_of_the_bells_sheet_music_guitaruatcs.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/gjmiajF/zokifo.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/hausgdB/derafodolis.pdfIn PDF document text
    • http://fdvsefwfrw.space/zalixejevorinedifidu37ylo.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/fichdgd/nursery_rhymes_videos_for_preschoolers.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/Vijqjdc/download_survival_game_lost_island_3d_mod.pdfIn PDF document text
    • http://omshop.space/antioxidantes_naturais0e25q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451941/normal_5ff0ba7ac2466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_6063fe9384952.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/gigghhc/virus_definition_for_kids.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipufo/jWijvgd/super_mario_run_download_apk.pdfIn PDF document text
    • http://santand-es.com/wordly_wise_3000_book_5_answer_key_lesson_12plq1y.pdfIn PDF document text
    • https://cdn.sqhk.co/mafokesaxuvi/gUsjhd2/gagikip.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/ghOSKhe/viridiana_alvarez_everest.pdfIn PDF document text
    • http://lnstagram-support.live/dazaxeruvodajujuwowefoker7b0t.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/JWUiaid/5063964491.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/2875a585-44b2-4975-b0d4-5113b27bcce2/29572500154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e96f22b-f6fa-44b0-9e41-278ac686f2ee/74096421282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ee9858-40aa-4c37-ae8b-7705eb548300/beragek.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_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 5088 bytes
SHA-256: 26325270522f3e3ff1475ae4e1c4667ef7c5f56d3f2d88941b8d920d8160d4d6
font_01_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 10240 bytes
SHA-256: 41dcfd09a89fb6da57b1e05d5fe26b9400c5fbef7da9bc2440f3814ac137313e

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