Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ed8c8c0c7657c0…

MALICIOUS

PDF

75.4 KB Created: 2021-03-28 21:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 86fe90d1aba33d92987cb0a482ac1ffd SHA-1: 165e517a69776f11a0b0cc616e837ae439b601ea SHA-256: 74ed8c8c0c7657c040b618712528e4b1447bbcfcd58f6a0dc38efc60ca1ad487
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=how+do+you+administer+medication+through+an+enteral+tube PDF link annotation
    • http://kefets.xyz/wagner_wood_and_metal_paint_sprayer_w100_-_280w_reviewszjoik.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://guvorike.weebly.com/uploads/1/3/4/2/134266232/3773860.pdfIn PDF document text
    • https://xugeragerowet.weebly.com/uploads/1/3/4/6/134641260/9775100.pdfIn PDF document text
    • http://rameautbxy.space/xatota6rins.pdfIn PDF document text
    • https://juxipidupe.weebly.com/uploads/1/3/4/6/134694928/9650482.pdfIn PDF document text
    • http://cmb-accueil.com/jesus_storybook_bible_online62gkw.pdfIn PDF document text
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/9c4b5.pdfIn PDF document text
    • https://dedejabo.weebly.com/uploads/1/3/4/8/134875177/2267373.pdfIn PDF document text
    • https://mofazutozu.weebly.com/uploads/1/3/4/8/134871383/8dc51.pdfIn PDF document text
    • https://zugasemoz.weebly.com/uploads/1/3/4/5/134593751/46860b739e33854.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20ff1b6-9573-4c4a-8ce9-39ebd3e8b600/what_is_the_ip_address_for_a_zyxel_router.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/87478297251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b3379c-e350-422b-8f53-afd56398ded0/bidugixalotubadijotasiz.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/strategic_management_case_study_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/xilemitapikiwix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6e0fb1-1001-4f65-af64-27130ff97b17/all_about_stock_market_strategies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fd7ed2-b779-4770-888e-d2da1df71440/albert_pike_morals_and_dogma_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/69223205952.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/fourier_analysis_t_w_korner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91d5ec5-92af-408f-b57e-aff324cd4cf2/how_to_replace_heating_element_in_water_heater_electric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4214be-bcea-46ba-9c7e-7cf57fa6898c/gods_ultimate_way_to_health.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_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 5648 bytes
SHA-256: db96c08d6e44bb5ab4254d331c2ba361fabb316d6406dfe6932668564aa0da7e
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 10384 bytes
SHA-256: a52c0a20896d3d6b36c2f1d200ef3e99eab9095efd14f1079726496477c4c8d8