Malicious PDF — malware analysis report

Static analysis result for SHA-256 91913994c49d449d…

MALICIOUS

PDF

73.2 KB Created: 2021-03-23 11:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a682330dc97ad26a23b64bde1379def3 SHA-1: 204c3dd05991f14b8b16807553403b42c6702746 SHA-256: 91913994c49d449d7f8da910aaf1bdd74343e50809eca02ebb4e3b238eecb3e7
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'maypoin.ru', which is likely a malicious domain used to host phishing content. The document body, though truncated, suggests a lure related to common search queries, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/strik?utm_term=why+does+my+transmission+leak+fluid PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5febf9e2d2d42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_604a2165ca297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387244/normal_5fd0dcbf1e0ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391319/normal_5fc63ec9dd370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489850/normal_5fdb7e195a7c0.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/48da05d8-76ae-4741-944d-5ce0175053b8/lamufekonetaxigeri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185adb69-c905-4fc0-9942-702496c04a75/navy_cpo_letter_to_the_board_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/marvel_avengers_alliance_2_obb.pdfIn PDF document text
    • http://sidajewaset.epizy.com/fusumev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b314df-be0a-4d3c-8930-48fefe2e278c/70897922173.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/new_orleans_saints_injury_report_week_6.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/iso_iec_27001_annex_a_controls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7988e2-5054-4de8-992f-a2d0a451953c/ritiziro.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/37111374839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c210ddc-6298-41f6-959c-fff75d02f9f4/shadow_run_steamboat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae8820b-b43e-4f46-bc6d-a283ac7cb4b7/wearever_pressure_cooker_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6073cc32-afbf-4a41-b18c-2aed14c31446/solenuxufilol.pdfIn PDF document text
    • http://xodijofo.epizy.com/what_words_begin_with_em.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e66004-e6c7-4f49-908e-b21f143e131e/how_to_play_spades_rules.pdfIn PDF document text
    • http://nujedanamepo.rf.gd/basic_computer_skills_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb9fb39-e94f-41e9-b1f2-ca0841a90a64/purpose_while_writing_an_essay_can_be_defined_as_brainly.pdfIn PDF document text
    • http://dajivetu.rf.gd/u.s._army_white_paper_format.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/how_to_use_karcher_k4_detergent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9fa1142-a2c8-4ccb-877d-9ea50ae91191/30216560850.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/92463126949.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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 5328 bytes
SHA-256: 68f44c9c5d120306cce46ce46a862d279c7b9b3ab96555be883b92d6ba0c9c38
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 10112 bytes
SHA-256: 3de7c50a1c450b9aee841e716cf7f751e063328dff17544287bae53bbd131206