Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6ed49bb39093f1…

MALICIOUS

PDF

77.9 KB Created: 2021-03-17 03:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e1fb4288958f9fa7237582d7c6c42f62 SHA-1: 58d992b864cd4e472fed7b9a1744badf202bc811 SHA-256: 3a6ed49bb39093f1190cd05808c4d569efb2462f47c42acc6851917438dd74bb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a malicious ML classification and ClamAV detection, along with the URL 'https://maypoin.ru/award?keyword=clinical+trial+data+analysis+using+r+pdf', indicates a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and link farm heuristics strongly suggest a malicious intent to lead users to potentially harmful content.

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://maypoin.ru/award?keyword=clinical+trial+data+analysis+using+r+pdf PDF link annotation
    • http://kinemulawaw.sportsontheweb.net/saxon_algebra_1_tests.pdfIn PDF document text
    • http://awpmode.com/bacula_windows_64_bitsrj8ml.pdfIn PDF document text
    • http://get3creditscores.info/82523788598ukk5g.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/ufc_strawweight_weight_rankings.pdfIn PDF document text
    • http://iranianvc.com/how_many_miles_can_a_2006_scion_tc_lasto0wyy.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/ppt_on_admixture.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_b33bc4915f384d76a30e58b493b92bee.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_97985c431a25458cbee41444038f3419.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_4edb621d16274f0c912a035fa0ad07d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dezajok/bridging_the_gap_powerpoint_template.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_bef5d0336a894960a3053db9c62e3ac2.pdf?index=trueIn PDF document text
    • http://memoxite.rf.gd/burrell_and_morgan_1979_book.pdfIn PDF document text
    • http://gekuvilis.epizy.com/kazonomudugavu.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_d7ef8531eeb74836bb7b09c1a7e79f24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xokebore/84290820189.pdfIn PDF document text
    • http://pugupokevimukov.epizy.com/how_to_open_samsung_ice_maker_door.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/wonulisedofomuzer.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_97d4a942841246e292698419f888f7cc.pdf?index=trueIn PDF document text
    • http://mupetebufobam.epizy.com/19001948545.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_9d94e453077f402d9ae84fa2c9c2ac28.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_d8e40fbe2959423c8fc70d253203328c.pdf?index=trueIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_3267313e6636456da171556f064d7303.pdf?index=trueIn 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_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 5328 bytes
SHA-256: 88099f42936b3033f2485d9c29f711007185756e782cb3dd505ef173b1130e2a
font_01_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 10664 bytes
SHA-256: 80308dc6d51564133ba809dbc61efb8cd132306c19f54a62bfe569bb49177c4a