Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d36c2181385ab3d…

MALICIOUS

PDF

76.7 KB Created: 2021-03-23 13:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ff2abc3033609548e504fd6c52ba94a1 SHA-1: c75e8409a1277786e64c835e58e2a3e42b0a130a SHA-256: 2d36c2181385ab3da46b89cf519586ebb0ae00316ca9adbacf04a2f5c44ae89b
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 0.9997

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://pelibifir.ru/strik?utm_term=how+to+save+webpage+as+pdf+on+mac PDF link annotation
    • http://flathead.us/how_to_heal_inflammation_in_the_body_naturally37omi.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/on_the_concept_of_history_walter_benjamin_summarymm0tu.pdfIn PDF document text
    • http://espacecmb.xyz/balancing_equations_worksheet_1______na3po41aqv5.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/rSjcicR/war_card_game_rules_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/1hhjpcI/51159442001.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/6ohb1uB/beach_buggy_racing_ps4_multiplayer.pdfIn PDF document text
    • http://zubiki.top/factory_building_design7yjxl.pdfIn PDF document text
    • http://fc-aromat.ru/bose_soundtouch_10_manual_englishgpn4u.pdfIn PDF document text
    • https://cdn.sqhk.co/nepopagugela/bic8Uvm/duck_hunting_highlands.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/jiwisi/decision_tree_analysis_in_r_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27bae0f-2c5c-4aeb-983b-69210162d206/how_to_be_a_graphic_designer_without_losing_your_soul_adrian_shaughnessy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62947351-7672-4e6b-a86a-d3ff1d0d37e7/68950565911.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_3ce041f2b95a4338a56e697510525a58.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_4f5b2ea6f5554d6a840d5defdc1b504d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d2674a-b839-4335-ba7d-ce990db0ce1b/how_to_repair_garmin_watch_strap.pdfIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_c0079dae553d4aad9600d92cd5248440.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26fcc99-0e2a-45e0-9324-2e83161d127b/14727681121.pdfIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_d07526a335f643bf931df66655cf8f19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44498173-8b96-4bf2-833b-e6edc4fa479f/is_qled_worth_it_over_uhd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c93fd0-1639-433d-bd83-c865b4153ef4/zareba_100_mile_fence_charger_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/creative_writing_for_dummies_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_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 5600 bytes
SHA-256: 7214f926fdc8e5c0734a826a1514220187478fcf621bbd8ae2c515a6ea87d8ec
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 10756 bytes
SHA-256: be41430679df8070721168d4d4d0f7dcfb89812fd57ba3ccc90707dd8307451d