Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c74cdb39b1c73c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-09 20:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a78c2eab9b6ef38f17576ba8c58389e8 SHA-1: 4861335359ece04880853e6f5ff443cf9b18ea53 SHA-256: c7c74cdb39b1c73cc5b0add755d5bb7703cdb07e68043919395a40f83f22cacb
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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 0.9997

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
  • 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
  • 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://crophysi.ru/award?keyword=third+grade+master+spelling+list+pdf PDF link annotation
    • http://komaxinatobofe.medianewsonline.com/java_8_features_best_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/jbgfJjI/zuputugizenufabopodafo.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/28_nosler_195_grain_berger_load_data.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/oYhfVif/52536982637.pdfIn PDF document text
    • https://cdn.sqhk.co/zapevexuvot/eji8ief/xuzojujalaz.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/84433807002.pdfIn PDF document text
    • http://expo-kit.ru/40098464773hotnp.pdfIn PDF document text
    • http://hopecommunitynaz.com/download_game_winner_soccer_evolution_mod_apkpdcwq.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/Tkhjhje/90990203957.pdfIn PDF document text
    • http://rawenspant.online/zezijisogozotivogowify61ud.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/9d545349-4dce-4fbb-8dfd-24c3c9f4d01e/how_to_draw_easy_stitch.pdfIn PDF document text
    • http://movasedumanepe.onlinewebshop.net/wanogixexe.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/forgotten_realms_elven_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7216b9fd-6d67-4c4d-a098-64e26a0a5e36/used_gy6_150cc_engine_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4ca1c6-ea17-4980-9902-989757d7fda4/88252354175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd2aef5-0c27-407f-a3fb-17c43bd69116/tutukurukowegoteb.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/chrome_extensions_android_ublock.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/year_3_money_worksheets_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3948b2d-9748-49cc-ba3e-9699c1a29f4e/83610073338.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/sandisk_clip_sport_firmware_download.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_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 5404 bytes
SHA-256: 29f96a580c4b36c4c8e4a6668ff4cb0fb7cab9a5d573b5d69f20ad585c35ec93
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 10148 bytes
SHA-256: a9daaf84cf18849724874fa364fe32c81f0005308568b6373c8ff83ad58bf808

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