Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0694b8cd133ead…

MALICIOUS

PDF

82.2 KB Created: 2021-05-28 17:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 482a735c0eb7d489efae52a0511b4d06 SHA-1: e814646494f1a35c21736c0de9270dab76155d8d SHA-256: 9a0694b8cd133ead5829313c78cbfe804a866a661f73ff633b1150a077675c5c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs, 'https://resalured.ru/strik?utm_term=what+are+the+negative+personality+traits', is flagged as suspicious. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the structure and heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://resalured.ru/strik?utm_term=what+are+the+negative+personality+traits PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477183/normal_604422864ff65.pdfIn PDF document text
    • https://tikuvafijosil.weebly.com/uploads/1/3/4/6/134685963/5781052.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/bb5b2a083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_601b4d3e3aeef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486983/normal_6062a8d396050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494893/normal_606cc6df739d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_605670f596344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493266/normal_5fe52ebc21c0b.pdfIn PDF document text
    • https://baxugufidet.weebly.com/uploads/1/3/0/7/130776886/39670cbb3ff3af9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_5fd6849fb25b2.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/2a6eef16-823e-4783-b1ba-838759b94f0f/how_does_data_warehouse_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff16c1b-f505-4355-ae1c-027f0651af24/nedexefugikiwixud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148c000f-2daf-4bf7-9ea4-f9eade7d2352/what_color_are_michigan_tabs_for_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bcf766-12a4-48b3-a822-d9ba2440fbbc/lock_pick_set__beginners_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb62b83-8cb5-474b-b9d7-2f2bfb9b32c5/duziginisirim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98edbc7-3752-494f-aa95-e8217d7e4fd7/39097286899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f948cee6-7e25-412d-b40b-ba5e2d933e6e/dell_optiplex_780_network_driver_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d4e657-7fc1-4129-bcac-674b326c4d26/88067236831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ec34c3-6790-4a27-a4af-c254ce054e9d/87779974265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1876775b-19b5-49d7-9972-75428588bde6/the_greatest_miracle_in_the_world_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56a0db9-c63d-4860-a435-a6738517a61e/the_secret_dare_to_dream_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7cf746-92d2-446a-88d1-b663e9ecd930/7820490785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f67ab5-e1e6-43b0-8bf6-56fb67056b38/how_to_do_mole_in_chemistry.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_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 5256 bytes
SHA-256: c654fb28818710faedd5da5c384c6a853fce8f89cedd0913c9fa1b5b9262f61e
font_01_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 10500 bytes
SHA-256: d98a87a6c0507126f5df06cd2777459b60cfd8886bdf4a55a335d59400e1cf8f