Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc842c3dd3ee53d…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 23:27:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b623f8dd0909062195ab822470a751e8 SHA-1: 9d0123c7b511da4776f8d9f507124a6f74bc417a SHA-256: 3dc842c3dd3ee53d25c98a7353f380df4a2c11bdade03fd9d5bc63176c20b28f
186 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. 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/award?keyword=lower+back+strengthening+exercises+at+home+pdf PDF link annotation
    • https://cdn.sqhk.co/dedesonor/sfijana/pocket_tanks_download_for_windows_8.pdfIn PDF document text
    • http://jazejoravasog.22web.org/guidelines_pulmonary_embolism.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/hggg4ia/37951747791.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/Jh4tjbL/criticism_of_utilitarianism.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/iIhHajg/99663532742.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/1b54cc73c40.pdfIn PDF document text
    • https://ketuvukelese.weebly.com/uploads/1/3/4/3/134351906/kepejijaseze-filir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5fe6dbd776073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_604ceec9b6ccb.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/i7kjbcK/vuwaloli.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/vinosivoluz_tezagi_moxajufu_tolomufegozidop.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/xususuruzokixe_lowuxugez_xonulubewu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471688/normal_5fc5eb01472c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dinuwulorixipe.epizy.com/class_8_maths_ncert_book_chapter_3_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b951c183-63ae-4382-b60a-d8178a364eba/linden_westminster_chime_mantel_clock.pdfIn PDF document text
    • http://lepamiruketujuf.epizy.com/sea_of_thieves_concertina_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148eecd0-609e-4504-bc19-1b6ecf670f31/macbeth_act_4_scene_1_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33abad9d-6e97-4974-b949-a0ff90d245ab/bersa_thunder_380_recommended_ammo.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/debawagomijiwuwumeliwug.pdfIn PDF document text
    • http://sobogewas.epizy.com/yamaha_rx-v375_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/facd81f3-5400-41da-81d7-09568fb072d5/why_is_my_playstation_3_controller_not_working.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_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 5844 bytes
SHA-256: b6af0c3ce2f2a0f6a380e16303b9cd3e2e448811dca9c4b91b01fed4c08d5864
font_01_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 10848 bytes
SHA-256: 511ed31d43d40cb1ff8d8c47afc0af5d6ff8e6c21b8d8ac240cc8c67eb444a27

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