Malicious PDF — malware analysis report

Static analysis result for SHA-256 053aa0d2beca8e92…

MALICIOUS

PDF

73.1 KB Created: 2021-06-05 23:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 547547e284aa58ca1450f584a84c127b SHA-1: c68825514376af303af38e5ca46254eebbeb39a7 SHA-256: 053aa0d2beca8e922f02edeacf7ec73f9deb924efe29c1544f95c016e7807a8a
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 0.9997

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://medvor.ru/pbw?utm_term=social+club+latest+version+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd60f7dd6c47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413469/normal_5ff668c44a863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_5fc6154b63e45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452389/normal_5ffc104bc73e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474450/normal_603c4714d40bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedetuwi.pbworks.com/f/nuwexiwamudukisafelux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5026f8-333a-49b3-86d2-d2b36bccf57a/how_to_operate_danby_portable_air_conditioner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f2ebf4-1b86-4649-8a6d-635cd683f33c/attributive_and_predicative_adjectives_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2e439f-6f70-40f1-8e40-7eb44822e6a0/what_size_tires_does_a_2015_ford_focus_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8c58ea-de1f-41bf-8eb3-935c71676b5e/how_to_make_wood_chips_for_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c748822-c396-483c-8ad4-7bdca91b237e/how_to_clean_a_carburetor_on_a_husqvarna_440_chainsaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef233d2f-e4be-416e-bc2d-5a66ec44d774/zefit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f903d43-6008-4a3e-9da4-c70998a93c53/saguxulirokubuvipovo.pdfIn PDF document text
    • http://pafunanukexe.pbworks.com/w/file/fetch/144653346/what_is_text_structure_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1366178e-3ad5-4fe2-a783-59414e16f8a4/cant_connect_brother_printer_to_wifi.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144511002/afterlight_2_free_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07315d05-9588-404f-97f8-74639f561ae7/what_if_i_told_you_that_i_love_you_lyrics_ali_gatie.pdfIn PDF document text
    • http://zawepiko.pbworks.com/w/file/fetch/144641598/56419042800.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/77876977449.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/f/fezewalozevasaxizukis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f241d3-20ac-489e-85de-0680cd1eabd8/foundation_science_physics_for_class_9.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_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 5412 bytes
SHA-256: 3478175ff3514c1f141e6e43743f26991859dbff34f880aec76974ba04872311
font_01_sfnt_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 12288 bytes
SHA-256: 09c4f3104452bfdc4fe3cd1f6faa3829b8224b920c799af777037ffad7415da4

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