Malicious PDF — malware analysis report

Static analysis result for SHA-256 57faba379f678c1b…

MALICIOUS

PDF

79.2 KB Created: 2021-04-12 20:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a2b1fba7a95f953093ce4c1a31489411 SHA-1: 5e87277f42bb87a3dee4a153b5ed6e6fc70e588c SHA-256: 57faba379f678c1b5f214bd4fd8ca4fee5e2eb80f6396e3447b2ead3e9ebc487
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 0.9990

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://druttle.ru/strik?utm_term=garmin+nuvi+255w+software+update PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377905/normal_604a5f455f188.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481684/normal_5fff0f0ccf553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421352/normal_5fe1d349033d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5fd5f62d30e7f.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/adobe_software_package_price_in_india.pdfIn PDF document text
    • https://cdn.sqhk.co/bemovunilupo/hgfBiau/milwaukee_rechargeable_headlamp_flashing_green.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/jc2zjb8/watch_live_nfl_games_streaming_online_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365608/normal_5ffebf0bb0c55.pdfIn PDF document text
    • http://zozamowewideno.mypressonline.com/bank_reconciliation_statement_format_in_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/pY2Txmc/lumumixuxamawasodasesete.pdfIn PDF document text
    • https://cdn.sqhk.co/rexixugepir/hhblgeu/72208258981.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/dibedamoka/is_cosrx_salicylic_acid_cleanser_good_for_fungal_acne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d8a09a-7f2d-48ba-b3dc-e2f96f0fcbef/tefal_safe_2_pressure_cooker_gasket.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/9413366761.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/88186172111.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_190a50bb0e3e444caffefef5118f1efa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/simplify_fractions_worksheet_7th_grade.pdfIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_06393618e8214c3db4ba55f21de1ad3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9de17b4-128d-4cc8-8ea1-558552a8ed6a/how_to_start_a_conclusion_transition_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597f0f0c-4139-46cd-8c79-847ed0e1482d/jaybird_x4_charger_jb_hi_fi.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_722fa31a9ae746048f908f7c23e0433e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midipes/72561492700.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/sagiwikelunufokesedawita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6c6fc5-08cb-4eb6-b136-06b02ab19ad2/dave_ramsey_monthly_budget_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace782bf-ebfd-4fa9-b1c3-60d16350be69/68516793933.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_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 5592 bytes
SHA-256: 34c72faabacd91f346fc0f8443111b597c27d591887eff0914273374a69be77d
font_01_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 10480 bytes
SHA-256: 0bf7cec118121b4d0f43ed6a91a82410b5c3e2e3cd26f37c79f8434a58d5b6af