Malicious PDF — malware analysis report

Static analysis result for SHA-256 74501d63415b715e…

MALICIOUS

PDF

77.9 KB Created: 2021-03-14 01:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3cecdd9978b3ff6feb5cfb87f979a9f3 SHA-1: 54337bf6f49ef984fb11e06c947e7b0b2a8c038b SHA-256: 74501d63415b715ed8f6573657990a2298740dcde35a12a2e3c867c56cc05003
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to disposable or potentially malicious domains, indicating a link farm or SEO abuse. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URLs suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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.
  • 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/wix?keyword=walt+disney+home+entertainment+logo+2006 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4393486/normal_6007a5e0ba5f5.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/basic_electrical_engineering_technical_interview_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455914/normal_603765b103262.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/beatriz_sarlo_libros_gratis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475738/normal_6007b961ced2b.pdfIn PDF document text
    • http://expo-kit.ru/whats_the_difference_between_diablo_3_ultimate_evil_edition_and_eternal_collectionbn1ye.pdfIn PDF document text
    • http://vnds-super.space/tewuvagemisixugowafanemaj8qe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_6030a41e43e67.pdfIn PDF document text
    • http://aydym.club/gikuwufebazapusofe3vlzt.pdfIn PDF document text
    • http://artelamp.store/cuantos_decimetros_tiene_un_metro_cubicoqd9fa.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/f490d798-37bb-4e97-a337-124871132951/lusenugufiruvaziguga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a68d491e-4b38-4fb7-9ff9-af39613159db/how_can_i_make_my_dryer_stop_squeaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252b8559-dc20-40bd-a0f5-08b2d6050670/night_full_text_google.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_80825ff6d9ca49ea8f837a2068e2acfd.pdf?index=trueIn PDF document text
    • http://timojodabemisux.myartsonline.com/pigavuwubaxox.pdfIn PDF document text
    • http://tavupikegoseri.epizy.com/bulimia_anorexia_y_vigorexia.pdfIn PDF document text
    • http://laroruteze.epizy.com/zudivizenobuteriwegew.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_4602ef4313464f8cbf0b012d4436319c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f0d29f-8776-4e19-b4a5-89f091f7f726/calories_dunkin_donuts_frozen_coffee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26679574-86f0-4141-889f-d769b7f5a089/what_is_the_most_popular_donut_at_dunkin_donuts.pdfIn PDF document text
    • http://fupewazogapoda.rf.gd/55690600948.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/wanovowiwetudidijebola.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_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 5784 bytes
SHA-256: 8e94659507a943e30306e5302d618ad077bab2a099f443cb33ef54e730ba2c4a
font_01_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 10552 bytes
SHA-256: 7f4ad641bcd8a71b41275e4443fcfa0ba261ac538cfdb34f905f5aeb4b7379df