Malicious PDF — malware analysis report

Static analysis result for SHA-256 171f8154388185a6…

MALICIOUS

PDF

84.9 KB Created: 2021-04-22 08:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d94b8166b0030148e577aec17f727753 SHA-1: eb9851a79bb9f88a177be0513289049cb45dff3c SHA-256: 171f8154388185a62dbffa0b9dbd035fb83ccc2121f4eb4947b56168adbc34f3
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://leonvi.ru/strik?utm_term=the+things+they+carried+summary+chapter+22 PDF link annotation
    • https://cdn.sqhk.co/wotirixa/jghG2Uj/end_of_animal_sacrifice_in_the_bible.pdfIn PDF document text
    • http://pakaxofuj.sportsontheweb.net/50708957577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484103/normal_606b523f99431.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/sample_case_study_about_business.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd6624b4f287.pdfIn PDF document text
    • http://rimiripa.mypressonline.com/o_estrangeiro_albert_camus_download.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/lebububosorejaku.pdfIn PDF document text
    • https://cdn.sqhk.co/muvifisi/el9LIjg/67113714772.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/bhgh8gJ/10257170479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379859/normal_5fd03d5e8cb15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_60609ee39f50b.pdfIn PDF document text
    • http://kanshoper.site/how_to_find_the_rhythm_in_a_poem0yq2a.pdfIn PDF document text
    • http://xeberul.mywebcommunity.org/the_weather_worksheets_for_kindergarten.pdfIn PDF document text
    • http://smeh-mif.space/organizational_culture_change_company_examplesdkj0d.pdfIn PDF document text
    • http://wejaduz.mypressonline.com/antonyms_list_a_to_z_download.pdfIn PDF document text
    • http://megiloreb.mypressonline.com/24915878387.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/8bkcoib/vekevokonidopas.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/Iajhity/chocolate_cake_recipe_with_buttermilk_and_boiling_water.pdfIn PDF document text
    • http://cadenalia.com/what_type_of_oil_does_a_honda_2000_generator_takejwsxz.pdfIn PDF document text
    • http://karaulovlife.site/96200857109k8cdz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fcb055921136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_97574943936e4e6cb39ffa5fedb366b4.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_44b863f1ec1f4a5fa94b1b3d6982b2c0.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_6489583061cd42bdb41cc4e0143abd6c.pdf?index=trueIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_213e6f515d1b4bf7bf49bd473dd5111b.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 5636 bytes
SHA-256: 1ab92d8db71693201d569c9c478ce4619bf14424e22090add5f71a6272487595
font_01_sfnt_off00010dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 10440 bytes
SHA-256: d1910d2db0a684c933f7b0743d27b7bae482f32a7f0b315ee37ea449c8f00e88
font_02_sfnt_off0001319a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319A 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15