Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be832ddc5a94362…

MALICIOUS

PDF

81.4 KB Created: 2021-03-05 16:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 21f7da141744162ab4ed6e74b0499c5a SHA-1: 9b1d68b66fc1dbc8d8a6bcc19bda513e0cbbac92 SHA-256: 0be832ddc5a9436276c406bb9b083f35316721ef704db82cbc35cc918955a426
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 0.9996

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://jottigo.ru/strik?utm_term=what+are+your+rights+as+a+landlord+without+a+lease PDF link annotation
    • http://calipshatngaccs1.xyz/75743407169681cz.pdfIn PDF document text
    • http://tryadasert.online/best_android_phones_2018_mid_rangev6e7w.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/kenmore_elite_dishwasher_parts_manual.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/685937652.pdfIn PDF document text
    • https://cdn.sqhk.co/funuwovo/WgewiaO/alan_hangover_baby_t_shirt.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/gchdUhi/13164429234.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/GjaZLhv/99356301744.pdfIn PDF document text
    • http://lerob.info/828458631200snzs.pdfIn PDF document text
    • http://teksalle.xyz/64428965072ptp93.pdfIn PDF document text
    • http://torchland.xyz/bunn_model_cwtf15_3l_pf_partsmxbuk.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/idHiiif/14385798264.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b778c560-a2be-41da-be54-42336ed4d843/what_is_100_day_plan.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_5777981448ec44edbb4f20487b9be2c3.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_1c57bc4e7dfa4fb2b855987845a79b36.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_81d55e22f98f47d2acfaff019b90a76e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc3c46b-57d1-4979-9dcd-8aa2097e92c7/how_to_be_a_better_icu_nurse.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/biosensors_in_agriculture.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/makorepezovepamenukurera.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_3189e94c69d2402ca1aa5a29e9ac2a5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/senior_financial_reporting_analyst_salary.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_c2d4a2118c5f48d7ab7e0495d42e3466.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 5176 bytes
SHA-256: aaab1a381717dfb9938038cc113fda2428c83cf1203ead14afc2467b8316ea93
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 11096 bytes
SHA-256: c73ee32290beae717dbb0b9b452e41e667948dcba3ec44c72e43c68a662a2305
font_02_sfnt_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2