Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4074d568bd7fde2…

MALICIOUS

PDF

75.5 KB Created: 2021-04-02 03:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 38f06e969cb653f4c1707753455b1ed3 SHA-1: 9bd36c8c9f343839d147545a34833322632c40b3 SHA-256: e4074d568bd7fde20a8f3629bed19133139fb4158bef7d43a0783c6e7347fa32
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 0.9991

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://zajinet.ru/strik?utm_term=heat+n+glo+gas+fireplace+wall+switch PDF link annotation
    • https://cdn.sqhk.co/fafujedajir/dqJMX7o/71294268275.pdfIn PDF document text
    • http://ru-payment.casa/83066435261avez8.pdfIn PDF document text
    • http://barashik.space/jiminibuzawasimivukojikiw0u3.pdfIn PDF document text
    • http://trycabinets.xyz/how_to_compare_and_contrast_essaygk18j.pdfIn PDF document text
    • https://cdn.sqhk.co/dosijowikul/igEjiie/21100280482.pdfIn PDF document text
    • https://cdn.sqhk.co/petebodok/1a6xhaq/90734209399.pdfIn PDF document text
    • https://cdn.sqhk.co/moxasapiwer/ee9ijjg/business_world_live_philippines.pdfIn PDF document text
    • http://shoes-storie.club/voluvarabukijiguzapidinvz.pdfIn PDF document text
    • http://3203epworthcres.com/jedivakuwogasavburgf.pdfIn PDF document text
    • https://cdn.sqhk.co/tikatonasa/KjdgfSG/39730887325.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/supply_chain_management_ppt_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/android_auto_google_maps_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01590577-b1f8-46b4-b05e-e00a13f60457/59413838167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/affe6c3b-2356-4b1f-9c68-ab6661aacfba/do_roses_grow_well_in_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47349852-f2af-4004-902b-ce5e68e0de22/zipamuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05292555-baba-4706-af13-8c2d0151dd7e/troy_bilt_42_inch_deck_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc75a79-0f67-45ce-9aba-86c0f79251b9/kubla_khan_setting_crossword_puzzle_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/72749608565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097942d3-4432-480d-8b14-b98f9f2e608e/how_to_get_work_as_a_proofreader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac744464-f62a-426d-931a-09905a8e0550/kuxatenevuminizuzevo.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/66879710004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a790cc-2c84-4e20-a014-65866a629394/how_do_i_setup_my_verizon_4g_lte_network_extender_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b6dec9-5798-4b88-a7de-d8043e64426c/line_information_retrieval_services.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f30a7972-8ef9-47c1-ba7b-588853c973b7/minororijipijed.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_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 5332 bytes
SHA-256: f92236a33a604ac5711a43405379cb09139e3c999f0ab6b5ba5c5e727b9c04d5
font_01_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 10260 bytes
SHA-256: f1b829e3b527f2fa086c3bf36d1dfc2f20b471ab979b47a03bcf46e1cda22b34