Malicious PDF — malware analysis report

Static analysis result for SHA-256 103c8e0a6c4b55c6…

MALICIOUS

PDF

78.6 KB Created: 2021-04-19 14:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 84a260687459d938000846c7ebb8599d SHA-1: 5dab2681f23e732c6a45d3409ff13350cdd18dcf SHA-256: 103c8e0a6c4b55c6a8cb90868ce3c7f5894ae88ebc678d95d51303fd1e3e5a09
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains an embedded URL that redirects to a domain associated with phishing or malicious content, disguised as a search result. The document body, though heavily obfuscated, appears to contain metadata related to its creation, suggesting it was programmatically generated to host the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://seumenha.ru/strik?utm_term=how+long+do+trane+hvac+systems+last PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461751/normal_6044936f1d4e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451930/normal_5fff5a7fec359.pdfIn PDF document text
    • http://sk-anker.ru/58432221853ggw66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_6023cc26367aa.pdfIn PDF document text
    • http://istlan.space/dikofurcubq.pdfIn PDF document text
    • http://cccckkkkkdd.space/8588144519obqsr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_60546470630de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423750/normal_60033a6c8eaea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388842/normal_5fdd66fb0ee22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427095/normal_604d0d249d367.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/74317937458ezo0h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fdbc4ced6c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5fd5f137c41ed.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/46fbbf9e-771c-4b7d-94ab-7b669bbd9091/jupubexakivokamepuzarexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b85d20b-2c24-47ea-b116-0104bf0e9bc8/9328402689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ce1356-f27e-4400-bc59-0396bef9f17e/viper_3305v_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5498c9f-1d9d-4929-8b94-87a563b6438c/mamipidutilerukimegoto.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/63086635091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e0d6e1-4eef-4d47-bec0-d4fea16a27cb/was_catholicism_or_christianity_first.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33a4542-3bc8-46a4-b5cc-a1d611152a7f/is_13_reasons_why_appropriate_for_10_year_olds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1542747-7efe-48ac-b321-7d80e2931498/google_maps_timeline_creepy.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/why_does_my_apple_keyboard_not_work_on_ipad_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c86c4f-b534-48f9-b8bd-e4684b7cf959/kohler_magnum_18_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a3eb27-e437-48be-b147-2217e8ab5f2a/psychoanalytic_theory_in_literary_studies.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/suputow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad38836-9cb4-44dd-8f77-83dac18e0551/how_to_read_error_codes_on_whirlpool_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/complete_works_of_swami_vivekananda_vol_1.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/zasazagenisuxisobakebijok.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_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 5568 bytes
SHA-256: 13c1685240d6785c2408979dc870122929ff4da43a1a6b920df5f62a269dcd83
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 10912 bytes
SHA-256: 19646d77de94e5bc3d69ea0504cecd0b00b8f60065f6469dfd079f6c05ddc899