Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29bc207d2aa2125…

MALICIOUS

PDF

71.5 KB Created: 2021-03-20 06:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4f88bd06afab7dceb8034af512f0a97e SHA-1: 92a1d684556189f6f74e6867b59f29046713e304 SHA-256: b29bc207d2aa2125044b2a3d51c12d2ba2a233796613b4a9127ed003a7ff4d0f
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://leonvi.ru/wix?keyword=wavecrest+management+team+ltd PDF link annotation
    • https://cdn.sqhk.co/vozogekom/hdfjjFg/anorexigenic_effect_of_metformin.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/mufegarux.pdfIn PDF document text
    • http://noseboxejekuxaz.22web.org/gagovilonodubazarewifarim.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/jK2lRii/diagnosis_of_ischemic_stroke.pdfIn PDF document text
    • http://raifaisentapp.online/colt_express_board_game_for_saleb1xg3.pdfIn PDF document text
    • http://ek-arenda.ru/polaroid_one600_classic_instant_camera_battery94vnn.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/24559103294x3bf3.pdfIn PDF document text
    • https://luzozesojuximu.weebly.com/uploads/1/3/5/3/135321468/494341a4.pdfIn PDF document text
    • http://tradestaroffice.com/3786203957720k4p.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/bjgSpjj/gidakuxavuj.pdfIn PDF document text
    • http://blacklaser.ru/73342798290stju9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todosix.epizy.com/37719990382.pdfIn PDF document text
    • https://6c967678-3fce-4d1a-bd98-eb0ee65f74fc.filesusr.com/ugd/9c43ec_3c5bf8310e994fd48c040d7f3044e9b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c9bae7-25ff-463c-b03c-05328c526cbd/constellation_map_wedding_gift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201687a5-a08c-4d08-8645-58e18adb4c6f/36863483250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ef1d0b-33d0-4a07-9870-33f9fe396f40/muraponapixevagaxakofe.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_04b00c58e2144a059a4ea2a0b1908992.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_d047dee598754ad9a6a1f31d4bb55df9.pdf?index=trueIn 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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 5332 bytes
SHA-256: 1c5c0841e659ea79a03b3ac8320b68171883b5ab1119bf6353670ae23b51a208
font_01_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 10632 bytes
SHA-256: 6992f3f2c3ce0ed8c88a67ca077ca4d0e955136fca18889394f4daf1f07816d7

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