Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35cc8cbaaa65045…

MALICIOUS

PDF

78.1 KB Created: 2021-03-31 09:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 53beb96ac1e6b3866dacacb79804ce85 SHA-1: 96a66169c29a10608095fa75cacf713c7950d679 SHA-256: f35cc8cbaaa65045aac0e18bfe6cbd7bc911c8670362b4af60f3afae3965e4c9
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://midufefew.ru/123?utm_term=amitav+ghosh+books PDF link annotation
    • https://gazulaloruvuv.weebly.com/uploads/1/3/4/6/134693071/nedad-fuwoninumoxa-matofawotexobi.pdfIn PDF document text
    • http://xalisuvo.22web.org/nejujujulumepaso.pdfIn PDF document text
    • https://jodexozemusokut.weebly.com/uploads/1/3/3/9/133999246/2737473.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/fatutisibikejigub.pdfIn PDF document text
    • https://dubelaxelafef.weebly.com/uploads/1/3/1/1/131164372/somivanelibedazoxub.pdfIn PDF document text
    • https://zalinojawovuga.weebly.com/uploads/1/3/4/8/134886974/8884028.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/c6372acc6793.pdfIn PDF document text
    • http://ladunosim.sportsontheweb.net/ca_residential_rental_agreement_form.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/duvof_sofudanabe_semedu.pdfIn PDF document text
    • http://xisubov.iblogger.org/php_ajax_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faleferesevo.onlinewebshop.net/gmat_analytical_writing_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d014436-7692-4427-981f-664fb69729d6/what_is_the_wsj_prime_rate_2020.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/sweet_child_of_mine_guitar_chords.pdfIn PDF document text
    • http://jonemif.epizy.com/historical_snow_report_cervinia.pdfIn PDF document text
    • http://nakepusigazu.epizy.com/what_are_the_advantages_and_disadvantages_of_starting_your_own_business_and_working_from_home.pdfIn PDF document text
    • http://sajojabop.epizy.com/how_to_calculate_interest_on_loan_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab397487-5e78-4a63-b0b9-6abd434c9d24/what_is_textured_walls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee4f68c-baec-4860-84d3-01de0ca0300c/natural_rate_of_unemployment_definition_economy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06d8f8f-74bc-4b3f-8a88-9bdfcc144857/mopupef.pdfIn PDF document text
    • http://bidexegope.epizy.com/necromancy_spellbook.pdfIn PDF document text
    • http://luzirilokupozar.rf.gd/you_can_t_hurt_me_free_download.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_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 5224 bytes
SHA-256: 49effbb04b8c83016eb86fec3464fae7fd554f81e2268a8a0da1588a6e95c212
font_01_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 11504 bytes
SHA-256: 6d278ebe4fa1f4302076b1b628a73bb9aa664fa2f002817935f8924890941e9e

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