Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf6cdf7d3a31eca…

MALICIOUS

PDF

78.0 KB Created: 2021-06-11 05:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b70e830ec102f8e8ebfc4b94ee0f0d45 SHA-1: 09b62ad51c8b9e15cf72392064c572a84ba9011a SHA-256: edf6cdf7d3a31ecaa1658ece41f0c85f61b59d5c1937612d0c272c04cc850349
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a phishing or link-farming scheme. The primary malicious activity observed is the redirection to external URLs, suggesting an attempt to lead the user to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://allytemp.ru/pbw?utm_term=evaluation+cm2+multiplication PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391909/normal_605f9b7c74fd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376852/normal_5ff4266482a60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://posonuxe.pbworks.com/f/cv_format_in_kenya_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61fb922f-b810-47a3-8982-d0733ab483be/cuanto_tiene_un_metro_cuadrado.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/w/file/fetch/144423468/99539648150.pdfIn PDF document text
    • http://seromazu.pbworks.com/w/file/fetch/144679278/reported_speech_indirect_questions_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/410f922f-68b1-4e6e-bb05-0a0faa5cd56b/how_to_play_21_basketball_rules.pdfIn PDF document text
    • http://xugilip.pbworks.com/w/file/fetch/144889566/69865982805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08bf6e5-a4ed-4e08-997f-44342eae269b/45089855235.pdfIn PDF document text
    • http://wurutaw.pbworks.com/w/file/fetch/144804534/20069369246.pdfIn PDF document text
    • http://gorixose.pbworks.com/f/99207538487.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/f/lutron_diva_cl_dimmer_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f1bd39-208d-444b-96b7-5cacb5ffeb81/98756027312.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/f/flying_sword_of_dragon_gate_english_subtitle.pdfIn PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144887562/power_plant_engineering_pk_nag_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8942392f-c7a0-472d-9b25-9d0623b6072c/54827914814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d7112a-3447-45a4-b069-e322ea8ff6c7/literal_equations_practice_worksheet.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/f/download_java_developer_kit_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33665ec3-99ff-48a5-bf23-034e68b79fea/how_much_is_boston_market_turkey_dinner.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 4716 bytes
SHA-256: c93ecf650d95d9fe375685a349509fe2cb254320dca1de504cc12b3de047b298
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 10984 bytes
SHA-256: d496261cac00802965bc07073fba480155ceefe34fd612fa92264ee29541f0d8
font_02_sfnt_off00011ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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