Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56a8eea1c4cd3bd…

MALICIOUS

PDF

69.4 KB Created: 2021-03-16 08:30:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 27acd7e3b55c2f9489e34e3847578a4f SHA-1: 1dfdb024847e1dc85e4ba06de2b27410941aac9c SHA-256: e56a8eea1c4cd3bdb20eaea674de7734b12941bcfdc628c6568267cc0ddd849f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/award?keyword=english+phonetic+exercises+pdf PDF link annotation
    • https://cdn.sqhk.co/pesenexur/cCFjfjd/turn_off_mobile_data_warning_android.pdfIn PDF document text
    • http://jekebes.iblogger.org/samsung_dishwasher_installation_brackets.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/grados_de_anemia_segun_la_oms.pdfIn PDF document text
    • https://cdn.sqhk.co/xozawimepod/gg4nUsc/feasible_report_on_restaurant.pdfIn PDF document text
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/e74e7b5e.pdfIn PDF document text
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/b3b17428.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/ZjiVWsh/fowevuguretuwus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowawaba.atwebpages.com/statistical_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842e91ff-7a68-4fe4-bb92-746d2b612aef/med_administration_through_peg_tube.pdfIn PDF document text
    • http://romepasuv.myartsonline.com/durekejasemafetolokoxiwol.pdfIn PDF document text
    • http://temekem.epizy.com/tiletufoxesimifokug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377af10c-5e82-4b4a-a40a-7d9ebbdee5a5/the_dharma_bums.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/protest_song_analysis_worksheet.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/engineering_colleges_in_pune_cut_off_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b36252-f2ed-4ee8-a26f-b7852d00b84f/how_to_remove_coffee_stains_from_carafe.pdfIn PDF document text
    • http://mogigavuxifiti.epizy.com/31003188883.pdfIn PDF document text
    • http://finesegugumemo.epizy.com/employable_me_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60f4d52-f090-4cdb-97e9-3a99d3db4ab7/what_are_some_political_issues_today_in_america.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c81399-b742-4ab4-8446-24a448da93aa/how_to_test_flame_sensor_with_multimeter.pdfIn PDF document text
    • http://wulumesa.epizy.com/project_budget_spending_plan_template.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_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 5232 bytes
SHA-256: 6b996ec9053a5d93807f4850ebc2e6587e72209eee7720808cf7d80ff03fcb12
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 10488 bytes
SHA-256: 771d9cb5d2337410394fc700b28a15ad7cd3097b58bfd22e7ed90b3bacf50878