Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae31dc694b0cb65…

MALICIOUS

PDF

78.4 KB Created: 2021-03-17 01:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e90c6fcac73ec95a37aa7fad5b053b45 SHA-1: 430d32b69aed461e6f5555734b9b11f7c92ca2ed SHA-256: 7ae31dc694b0cb651ea3e6ca8c5400e46f32d3e0f885291e5fbbfbff7bf457b2
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 0.9997

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://dugedepap.ru/123?utm_term=practice+9-+4+rational+expressions+answer+key PDF link annotation
    • http://interbankdigital.com/how_do_i_find_my_ups_shipping_account_numberbz3pg.pdfIn PDF document text
    • http://ita-fitness.fun/easy_ice_cream_recipe_no_condensed_milkx5j5m.pdfIn PDF document text
    • http://tewosube.mypressonline.com/ada_compliance_checker.pdfIn PDF document text
    • http://xozonline.ru/ziwibesegodqyjzu.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/62004925960.pdfIn PDF document text
    • http://tavaxibewoposo.iblogger.org/nunatuxugegokavujokabe.pdfIn PDF document text
    • http://lollipopa.online/56430838366ed5u7.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/percy_jackson_3_castellano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medazupu.onlinewebshop.net/vishnu_sahasranamam_sanskrit_hindi.pdfIn PDF document text
    • http://ravexigulot.rf.gd/manuale_ti_89_titanium_italiano.pdfIn PDF document text
    • http://tavawefojob.epizy.com/49024040545.pdfIn PDF document text
    • http://zitoveruvet.epizy.com/steel_tensile_test_lab_report_conclusion.pdfIn PDF document text
    • http://bidejepeko.onlinewebshop.net/what_are_the_different_types_of_ecosystem.pdfIn PDF document text
    • http://laxukumelukadut.myartsonline.com/bipijowekiweloru.pdfIn PDF document text
    • http://kadorekamik.rf.gd/budesexe.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/what_is_the_average_monthly_income_for_a_family_of_5.pdfIn PDF document text
    • http://laxolagodofomug.onlinewebshop.net/advertising_and_sales_promotion_management.pdfIn PDF document text
    • http://kebanibaru.epizy.com/92511857100.pdfIn PDF document text
    • http://zudozam.epizy.com/differential_calculus_derivatives_of_algebraic_functions.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/does_sat_give_you_math_formulas.pdfIn PDF document text
    • http://bufafaloverodi.rf.gd/can_i_have_farm_animals_on_my_property.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 3664 bytes
SHA-256: ac66f249644e4521da6a320da331c8969f02450b299b288ef2552f0e90563433
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 5528 bytes
SHA-256: 7d5a79adc7076543adbb0a4f52613df2cdc87531b6020425c567f928f86715a5
font_02_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 10360 bytes
SHA-256: f32ccb216a165d298ec4261a8306b42af624ea6326b7e591412b307896b54c0c