Malicious PDF — malware analysis report

Static analysis result for SHA-256 4305e4bd6c773554…

MALICIOUS

PDF

77.5 KB Created: 2021-03-12 20:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c381b2d31ccaf63e0b7f66a909c799b5 SHA-1: 1e53197293261a3c0d166a742efbf382b6503824 SHA-256: 4305e4bd6c773554987da960fef745491dc72d1f7efdea7039f514e2ef63bc88
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/award?keyword=sistema+circulatorio+pdf+libro', are designed to redirect users to potentially harmful sites. The ML classifier also strongly indicated maliciousness, supporting the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=sistema+circulatorio+pdf+libro In PDF document text
    • http://tideparipawovu.mygamesonline.org/abit_ip35_pro_xeon.pdfIn PDF document text
    • http://arendaavto.taxi/gebulizozevidosifighp33.pdfIn PDF document text
    • http://pavawafupef.66ghz.com/70742989577.pdfIn PDF document text
    • http://indital.fun/petsafe_shock_collar_not_workingkhuh3.pdfIn PDF document text
    • http://acupofjacob.com/honeywell_hz-789_wheelsi9eme.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/gregor_the_overlander_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/descargar_badland_apk_full.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_6874ee4d81ff4479958e5206a9343bb7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52c9215-35ef-46c2-b84e-de141eb6c626/the_bible_quran_and_science_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92b7388-f85c-4692-aef7-e3799f81ac79/gelak.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/alamo_car_rental_insurance_information.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_a166261f86ae4df68a5b3bc4fcee664a.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_7aee63a028a64d59b8f33324c1af02b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezutu/foundations_in_personal_finance_answers_chapter_6.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_533de4198f244c90b40748428545b93e.pdf?index=trueIn PDF document text
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_3a13d91fae84423aa9c6e0be984fbfde.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/91388952134.pdfIn PDF document text
    • http://fujeximadotut.rf.gd/mmda_traffic_report_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2080d601-26f3-480c-a592-41c84670ba89/56305963460.pdfIn PDF document text
    • http://wemosoxa.rf.gd/dilebujeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd36223-127a-42fb-866e-4a8f8ec90bd3/how_much_is_a_dvr_box_from_comcast.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_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 5544 bytes
SHA-256: f96c54e3de26e27f93e3efee8b14554c86c4df0f736b9191e0174177d41ce3d2
font_01_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 11288 bytes
SHA-256: 0f489144293791c92feab666bed564925a719cccacb065c592bfe5a198cbc9fc

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