Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a67f7fd8bfa5bbc…

MALICIOUS

PDF

75.2 KB Created: 2021-04-30 14:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1c58a076d032eb21c0b38355a8d5b2e3 SHA-1: 71e3e764a8ffac954e774cc27b38e845401dcbbf SHA-256: 5a67f7fd8bfa5bbc51a5171af641922be26a965552d8baeb5a6b4c2b151de5b4
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://bologen.ru/strik?utm_term=how+to+update+j5+software', suggests a lure related to software updates. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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://bologen.ru/strik?utm_term=how+to+update+j5+software PDF link annotation
    • http://retamos.mygamesonline.org/jopajazepojov.pdfIn PDF document text
    • http://24goodstore.site/major_mayhem_2_free_downloadqerkg.pdfIn PDF document text
    • https://pilituxasi.weebly.com/uploads/1/3/4/6/134685590/kajediwawasowelevux.pdfIn PDF document text
    • http://rankingcoach-apps.com/99302943878mzgg0.pdfIn PDF document text
    • https://kejedavozeve.weebly.com/uploads/1/3/1/4/131483662/58dd7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_60622aa95ac4b.pdfIn PDF document text
    • http://auto-agents.space/62259443166idjh.pdfIn PDF document text
    • https://revevapeseguv.weebly.com/uploads/1/3/5/3/135387876/4643012.pdfIn PDF document text
    • http://ukranews.site/eustachian_tube_dysfunction_clinical_practice_guidelinesr0bdo.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/suzuki_250_atv_carburetor_diagram.pdfIn PDF document text
    • http://bristol-yalta.run/monteverdi_cantate_domino_sheet_musicv7xaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427498/normal_5ff53b31ccadc.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/10_steps_of_service_for_servers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokekakeloji.onlinewebshop.net/sabamomavuvefukoberelozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba11b2e-f1c8-4d79-943e-2aeedb73c6b0/factoring_the_sum_of_two_squares_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/hour_of_code_frozen_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/alta_performance_academia_juiz_de_fora.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/wezawujisadudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24aafd4-269e-4492-b7fb-e74f4fdc8fdb/bradley_original_smoker_heating_element_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eaedf32-de0c-4334-9520-a371271d90fc/tajej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/047daaab-7290-4d6e-ae1e-c4d8aa78ec72/88823189058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f6d294-6dc9-47c8-990e-86d76a9d8ef3/keguwonubobuferuvi.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_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 5256 bytes
SHA-256: caa600adb55ae6e1cd991618f47b3dd16344251fcdbe349360cc6793c9aacc58
font_01_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 10684 bytes
SHA-256: 035ecb5c1118dcb173520bc4737badef158814fe61228915d8aeba08cb911b33

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