Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d60c05a3f7e339…

MALICIOUS

PDF

77.9 KB Created: 2021-06-06 22:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2a28576d13b9a6d9464d8896a90e33a2 SHA-1: af904df7c9609cb96ca05d713410152f0ceae82a SHA-256: 09d60c05a3f7e3398cbe716a8fe576ecce6d26b6079a1eae3c1278d7caf1ae86
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point to a malicious document designed to leverage external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://philabc.ru/pbw?utm_term=realidades+2+capitulo+3b+guided+practice+activities+3b-4+answers PDF link annotation
    • https://lisamotakix.weebly.com/uploads/1/3/4/3/134308999/3d8674032e64b2.pdfIn PDF document text
    • https://sujefamop.weebly.com/uploads/1/3/4/7/134762109/2705458.pdfIn PDF document text
    • https://zalirusupu.weebly.com/uploads/1/3/4/5/134516706/faveketete.pdfIn PDF document text
    • https://sixanatol.weebly.com/uploads/1/3/4/6/134631849/8063288.pdfIn PDF document text
    • https://bebedukiraf.weebly.com/uploads/1/3/4/8/134885496/02c66490cc2d66a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawanixum.pbworks.com/w/file/fetch/144521466/job_offer_letter_from_employer_to_employee_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a266be6-979a-441e-b6b3-61678f12a664/the_electromagnetic_spectrum_worksheet_answers_section_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eeb89e6-b6e5-4cfa-b228-8b940d5a8f3a/huffy_bicycle_parts_catalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85473d58-9165-4149-8c44-7517153aa573/whirlpool_washer_not_spinning_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee05da1c-8ec1-4df9-b23f-02c6eb7d6467/what_is_the_meaning_of_aggregate_planning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020be483-aba9-425b-a515-e9e49a732c23/gufutoviranep.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/jotulowulelove.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/f/blender_2.79_manual_espaol.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144631485/how_to_write_a_business_plan_for_real_estate_investors.pdfIn PDF document text
    • http://gabumur.pbworks.com/f/why_god_chose_peter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f4c2a5-7785-4046-9bca-b560217e8aff/96108792323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6ca0b7-0b33-4a5e-a35a-3e880cca5f35/rabur.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/f/57881782774.pdfIn PDF document text
    • http://razodegotit.pbworks.com/f/dan_lok_book_unlock_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d280695-fe0c-4a28-9f85-ab2ffd251b94/94304637876.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/f/2006_chevy_malibu_repair_manual_free_download.pdfIn PDF document text
    • http://marutipug.pbworks.com/f/ickle_bubba_stomp_v3_pushchair_assembly.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_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 5956 bytes
SHA-256: 2d5dd60714aa03d78c5e1aed9064dec3f02946fb35d184396900275618e718e5
font_01_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 11440 bytes
SHA-256: b5a64ea25e0a39d4ba5af68a6a841ef8cc1cb1a68bad740ddd55fa0928793beb