Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6fe98b11d6880e…

MALICIOUS

PDF

83.3 KB Created: 2021-04-02 05:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 10d5c6586a67d17693f93586f9a6eca7 SHA-1: 2975d1b62667b73f184b0a90d9b98d2e37daea01 SHA-256: 9c6fe98b11d6880e2328839162c47081ba182cb2c80b6f275b34eeeef79960cf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting or domains with unknown reputations, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=el+caballero+de+la+armadura+oxidada+capitulo+1+y+2 PDF link annotation
    • http://pajiweputuniwas.iblogger.org/nususozuwujixusifup.pdfIn PDF document text
    • https://sidatugalelukad.weebly.com/uploads/1/3/4/6/134639108/5dbed83b0aaa7.pdfIn PDF document text
    • https://bivunuse.weebly.com/uploads/1/3/5/3/135392281/favepe_domerutemofaf.pdfIn PDF document text
    • https://gotanizanoga.weebly.com/uploads/1/3/5/3/135332446/faniw.pdfIn PDF document text
    • https://tovuwofox.weebly.com/uploads/1/3/4/7/134731163/monon.pdfIn PDF document text
    • https://mosodujisar.weebly.com/uploads/1/3/0/7/130739504/dafev-kakumazok-tewaluwikugu.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/d765c324-32a4-469c-8686-1d8c975c9c62/fidomazage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f23662-4353-4dff-97fe-c0b6561c9c8d/fundamentals_of_search_and_rescue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e10441f-a814-4072-aafb-df15157f2647/delta_miter_saw_review.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/zojezobebolujef.pdfIn PDF document text
    • http://zofigofaka.epizy.com/infinitive_or_gerund_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/399fcb51-e7db-40c3-91fd-c017c58a8102/kesuwegoxiriguxozitebib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6150bd5b-1dd0-456c-aa17-b4b60542f04d/ccna_self_study_material.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8144a5f5-6396-4328-986e-f501ba56a289/dedijidul.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/iim_shillong_placement_report_2019.pdfIn PDF document text
    • http://lamiredej.epizy.com/mystic_messenger_yoosung_text_answers.pdfIn PDF document text
    • http://nunitew.rf.gd/87596217065.pdfIn PDF document text
    • http://sawokemapixaf.epizy.com/getifemulalanexelagureg.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/sigisosofexujuxamixadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8754c5f0-f585-42a9-a90c-0d488ece36f6/my_cloud_home_wd_app.pdfIn PDF document text
    • http://sirilamezowi.epizy.com/22019619268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f60edb2-0600-46de-b261-753aceb15be8/arduino_vs_raspberry_pi_zero_w.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_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 5492 bytes
SHA-256: 1bc52240dfd4cdecfdda72f7479f112d9d2ddbd61a2f5e334fe3b0f6ef06bae5
font_01_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 11992 bytes
SHA-256: c09454b31f9d2378ebac0bdf5ee7adb0f497b21b08e204c5408db0e46db37548