Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be5603add4d8c72…

MALICIOUS

PDF

82.8 KB Created: 2021-06-06 10:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a63b10cc5579ead9a9658a7b8dd69795 SHA-1: c52bc9cdd3330db5f149e1106d600584860d3445 SHA-256: 7be5603add4d8c72ff8cb97cd11b6d3a9adcbd2a794b27d0ade09c7d0cb914ff
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a primary URL pointing to 'https://wastran.ru/pbw?utm_term=2002+ford+windstar+owners+manual+pdf'. The presence of a large number of external links, some on disposable hosting, suggests an attempt to manipulate search engine results or direct users to potentially harmful content. No scripts were extracted, but the PDF structure itself is leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/pbw?utm_term=2002+ford+windstar+owners+manual+pdf PDF link annotation
    • https://fabubujiruku.weebly.com/uploads/1/3/7/5/137503297/jajopiwaba.pdfIn PDF document text
    • https://wajodiladifaxuv.weebly.com/uploads/1/3/4/7/134768632/pufekuwadaluweniru.pdfIn PDF document text
    • https://vuxisiso.weebly.com/uploads/1/3/5/3/135321279/desaloxotejaw.pdfIn PDF document text
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/jilunidibeb.pdfIn PDF document text
    • https://potuvomominoneb.weebly.com/uploads/1/3/2/6/132683031/7feae809b677ab7.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/2aa0eb7f-7a98-4a1f-8801-998142633d02/81225056031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7352c6-1e78-4e70-b092-c0468b0b28e1/business_japanese_vocabulary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81f91ab-b340-4dc8-a2f5-b4fc3afe2642/what_are_the_income_limits_for_michigan_medicaid.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/64183312713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59606747-fdf3-4009-942f-3b328645eba5/east_of_eden_chapter_21_summary.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/f/xetesepasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07f4af4-0aaf-4391-b49c-d1aca938f6ec/tractor_supply_cannon_safe_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef4b012-68f5-4f6e-9c4b-e4dbd765d5cf/27721523191.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/w/file/fetch/144492648/47428735097.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/f/terry_tao_measure_theory_solutions.pdfIn PDF document text
    • http://tagutijak.pbworks.com/w/file/fetch/144677505/theory_of_computation_multiple_choice_questions_and_answers.pdfIn PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144562908/how_do_you_write_a_formal_letter_to_a_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf14fdb1-0dfa-4845-8298-e3e62ff4e55c/27075284230.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/vilub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17cc16d9-87be-4088-b1da-56100064ba3a/how_to_read_confidence_interval_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a57659e-2af0-4734-aa4d-ef8755535241/how_to_stop_being_average_in_schoology.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_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 5460 bytes
SHA-256: 979af2da34e9bbf5fc029acf41e03e8f60048ce71a36e89f644c7bff6570b2c8
font_01_sfnt_off00011734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11734 11672 bytes
SHA-256: 902cfd87c695888637c2c5a0b52d40937d370b30bb41e035317cd49c72ecf534