Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d3ad9387603b9d…

MALICIOUS

PDF

74.8 KB Created: 2021-03-18 06:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2475498fcf107e7b3cff1e5c5bd56c78 SHA-1: 855552ed1a831c05c92a0184afd83510a47c780c SHA-256: c6d3ad9387603b9dce8dc04a050d111225608eca3eb0b3f8174b2ecbc6cd4339
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-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://leonvi.ru/award?keyword=programming+abstractions+in+java+eric+roberts+pdf PDF link annotation
    • http://hallop.xyz/what_do_you_do_when_your_xbox_360_controller_wont_turn_onenfp0.pdfIn PDF document text
    • http://gratoramm.website/are_leaf_footed_bugs_harmful_to_humansfe29p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_602647c397ca4.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/Jiakidd/islands_of_adventure_harry_potter_shops.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_6018784c549c7.pdfIn PDF document text
    • https://cdn.sqhk.co/belexewuwif/c43gdti/92165166065.pdfIn PDF document text
    • http://okclub.org/the_selection_movie_free_downloadere3eya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_602eb3a69206f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479942/normal_6008d031873e0.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/hggiVhf/starship_troopers_battle_stars.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5ff88e40e75eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465389/normal_5fe4ef5d85c87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5fe5008844691.pdfIn PDF document text
    • http://oneitshop.pro/brother_mfc-7860dw_clean_drumms2z2.pdfIn PDF document text
    • http://copyrightsupport-ig.com/bastien_vives_bdc66jb.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/0caa199f-3ed1-4409-8146-5e3028660e57/shear_flow_in_steel_beams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c1b9fa-93d6-4db2-94eb-ed6bcb90712c/conjugar_verbos_en_ingles_traducidos_al_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1b5c33-f6df-4888-810d-b473cecd91c4/john_deere_d140_drive_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ae2408-8609-40ee-8182-8deea980df7c/94702605100.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_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 5720 bytes
SHA-256: 86d9546890d9a231872375136ea59f6769ea09ac5f6b4bb71f6812add585a1ec
font_01_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 11324 bytes
SHA-256: 8f9f583d74475f207d5ebe492decad532f14194560d9c49063869e9d50e86468

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