Malicious PDF — malware analysis report

Static analysis result for SHA-256 681ce43a0aa48bdd…

MALICIOUS

PDF

81.0 KB Created: 2021-05-29 01:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9200418283557a36ca701f6691831d5f SHA-1: 293ff339f0ed7d67977b34039489377f769a6eb3 SHA-256: 681ce43a0aa48bdd98b3c0b1abbd3e60f6a62a3031e1069b54583415a9d5df66
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, and the document body, though heavily obfuscated, appears to contain keywords related to hacking. The presence of numerous external links, many pointing to PDF files, suggests a link farm designed to distribute malicious content or engage in SEO poisoning. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://crophysi.ru/strik?utm_term=how+to+hack+clash+of+clans+account+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415527/normal_6035d874d6e5c.pdfIn PDF document text
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/0a24f0202c5.pdfIn PDF document text
    • https://tozubovudifudi.weebly.com/uploads/1/3/5/9/135973827/058706b256aa46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473388/normal_60482c458f4e9.pdfIn PDF document text
    • https://sarodinejafa.weebly.com/uploads/1/3/4/7/134762654/luselukizujepunirama.pdfIn PDF document text
    • https://fototinuvanumef.weebly.com/uploads/1/3/1/4/131406749/werajunup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_6063f8285c205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_6032e5c7d069d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457573/normal_600941b51b18d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457839/normal_600415fb28e7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_601153f53ccab.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/d02ef179-a8ed-4a9b-b1cd-0f464898d753/gujirozapomufidasenomar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fadb21e-70ba-4a9f-ab57-a4cf5115393b/free_to_word_converter_software_for_large_files.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c501d1da-7748-4f21-9822-8d6f6bd8df3e/basatezujeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f06f9a5-6636-4b28-ab78-4d6342a18e04/social_contract_meaning_of_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1acb115e-a1d3-4af1-85de-0f046243c9d6/tappan_electric_range_heating_element.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db24c747-9f5f-435f-aeb3-09f90f5d7bab/club_car_golf_cart_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dcb260a-34d0-464a-961a-e2929158385f/fugujevugotimuvoluver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f747d1e-7643-42c1-80e6-dd92289118bc/31143682544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f98476-ef67-46b7-89c1-bac01c3f53a2/sunbeam_oskar_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5666ea1e-2a32-45cf-850e-8f1486a88510/how_to_program_fire_stick_remote_to_control_tv_volume.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_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 5264 bytes
SHA-256: 2041345f03ce543d5caa8d623fe113eb2c670328ecec15435346520957086b1b
font_01_sfnt_off0001117c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 10912 bytes
SHA-256: 19706e178934e8491b3f91b40d08daf8efaa8d15144fc9a769741a2177bf890e