Malicious PDF — malware analysis report

Static analysis result for SHA-256 39396a0da877a5d3…

MALICIOUS

PDF

73.4 KB Created: 2021-04-01 08:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 69b3e31b7c2b259b60e091c6a374aa18 SHA-1: 545d1d9205f117638d2706773e75a54e425b1c85 SHA-256: 39396a0da877a5d32eb7ee09af263c64254e6525524764b150f0d8899e3ae364
126 Risk Score

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 0.9989

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/award?keyword=os+axiomas+de+zurique+pdf+gr%25C3%25A1tis PDF link annotation
    • http://arenda-comp.space/nejajewesonoza1ijop.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/hZzhhWE/36459880248.pdfIn PDF document text
    • http://pitushok.space/desarrollo_de_una_mente_prodigiosayir0j.pdfIn PDF document text
    • https://lugukeku.weebly.com/uploads/1/3/1/4/131407734/a092fc54.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/tic8Thb/best_free_world_games_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/oaM8hi1/the_legacy_of_the_bones.pdfIn PDF document text
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/5de274a.pdfIn PDF document text
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/507984.pdfIn PDF document text
    • http://dudakarebonadi.iblogger.org/z_score_table.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/64802116903.pdfIn PDF document text
    • https://xidoferowugefu.weebly.com/uploads/1/3/4/3/134348033/golagabi.pdfIn PDF document text
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/3057077.pdfIn PDF document text
    • http://sokepazetovul.22web.org/fluval_305_canister_filter_setup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d944a1b-c2ff-4044-874c-0205cae95d98/whats_in_a_taco_bell_breakfast_crunchwrap.pdfIn PDF document text
    • http://ruxofepugoloma.rf.gd/36092655802.pdfIn PDF document text
    • http://purupuladufuba.rf.gd/all_information_about_football_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aab0504-9ade-4a4a-8a18-55f940bd08b6/96565394077.pdfIn PDF document text
    • http://jujorek.epizy.com/62933844734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51bc60e8-41c5-44cf-8983-4cd432967b48/watch_princess_bride_online_free_streaming.pdfIn PDF document text
    • http://tokewaperomuveb.epizy.com/sukodura.pdfIn PDF document text
    • http://retuliz.rf.gd/aristoteles_y_la_logica.pdfIn PDF document text
    • http://vedopurunidir.epizy.com/alondra_nelson_body_and_soul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3850052d-ed5f-4e99-a6a9-a41ba1e22921/does_time_capsule_work_as_a_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e99608-16ff-43bb-863b-09d1e084d7ce/what_are_the_12_elements_of_poetry_ppt.pdfIn PDF document text
    • http://puwolir.epizy.com/tunejajagipotugom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 5836 bytes
SHA-256: 9d1c52dd3cb710eb2d86129f451ef14d249738a1cfeb42b6295f696df29c05e3
font_01_sfnt_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 12332 bytes
SHA-256: 185e5831e4a87f86799dd13be16b13bf91a1b1ef78191340aa11bd3da49d0f9b
font_02_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 2072 bytes
SHA-256: a125880617f055dc94cbd2cd4c315700ebc997ec6103356a171f2de6018e5b7c