Malicious PDF — malware analysis report

Static analysis result for SHA-256 794807ea612f833e…

MALICIOUS

PDF

75.1 KB Created: 2021-03-25 01:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 61e40e0761cffcaa9c1bdaaf130a372f SHA-1: 1f8dac2782a1841144204b1d0553ce1b671f6819 SHA-256: 794807ea612f833ea1bdb29a19122c4897c8c10cca5914610a9cdd1235da6686
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of external URIs and the link farm heuristic suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=the+five+minute+journal+amazon.ca PDF link annotation
    • http://invitesistem.ru/73041773880h1cjw.pdfIn PDF document text
    • http://fiwazurenorin.iblogger.org/how_to_change_a_lux_thermostat_from_celsius_to_fahrenheit.pdfIn PDF document text
    • https://cdn.sqhk.co/xivudebisov/jbhhhiM/ding_tea_athens_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/jeHhgY3/interesting_facts_about_mexican_culture.pdfIn PDF document text
    • http://douchehq.xyz/the_80_20_principle_by_richard_koch_audiobook_free_downloadmh89r.pdfIn PDF document text
    • http://vertigoa.online/25470553379qrsh2.pdfIn PDF document text
    • http://playmarket-online.com/12493605636vvoo8.pdfIn PDF document text
    • http://itfamily.pro/formation_auriculothrapie_geneveguuyi.pdfIn PDF document text
    • https://cdn.sqhk.co/pobojatizopa/ihLjihf/demons_cover_boyce_avenue.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/c1599878-042b-42f4-8f71-a11626ca5c49/nutone_central_vacuum_cleaner_parts.pdfIn PDF document text
    • http://bupikizatigog.rf.gd/60337512948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685b1c54-ffea-4c58-bbe0-83b3d85e188d/how_to_measure_cardiothoracic_ratio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcb74ff-0857-410e-9188-a4cce5849e33/kaxigaseberamagega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee70ea5-f9d2-48d7-99ad-6e9fb6549c77/royal_navy_diver_ranks.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/free_apps_ios_7._1._2.pdfIn PDF document text
    • http://nonilugubosaz.epizy.com/acrylic_standee_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62fe144-3050-4a78-951f-4f2ac2d12cbe/spanish_a1_vocabulary_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372db856-6bb4-40c9-97fe-0d686d7bdc00/how_to_sync_jbl_soundbar_to_tv_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/hek_bonusheft_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f912b935-e88f-4339-bb81-fd4f6d8a863a/lemuwozijora.pdfIn PDF document text
    • http://ziboporo.epizy.com/gst_calculation_in_excel_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66cd3e05-cbe9-48ad-a0bb-47f3ffea9cf6/blue_jackets_vs_lightning_game_1_start_time.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_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 5108 bytes
SHA-256: 38916631c661f3e9d13ee8974c9bc16291ce1ea160b7cc6bad5a079c6b30bb9f
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 11176 bytes
SHA-256: ab6d688c10b21e91c347dc3ce2721a4740ec1eed4c9e7f9ad3acbc4a38633788