Malicious PDF — malware analysis report

Static analysis result for SHA-256 f691842dd691e0bf…

MALICIOUS

PDF

76.7 KB Created: 2021-03-18 07:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 96b74ac1d87c0f2fd41621a9eead4bca SHA-1: 7d83d38d187297b3722e56e5500f19ba61a81418 SHA-256: f691842dd691e0bf14ee8c580ecec439f5b843fe40b5c0c6ce78c56e497a8504
186 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier returned a high probability of maliciousness. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The URL 'https://vilenefex.ru/123?utm_term=axcrypt+android+gratuit' appears to be a lure for potentially malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/123?utm_term=axcrypt+android+gratuit PDF link annotation
    • http://filmera.ru/is_inferno_on_netflix_canadao9f9w.pdfIn PDF document text
    • http://lalevuw.mypressonline.com/24676254724.pdfIn PDF document text
    • http://natur-bio.space/wigawur47u8.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/mimupurudogenapot.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/bread_making_101.pdfIn PDF document text
    • http://tugrull.com/rollercoaster_tycoon_apk_data4q79b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_c73a01f542404e7b88ebb485c28cf713.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/691312a6-c4f5-42a0-b1a6-71c30a6fc3d6/what_is_manufacturing_process_and_automation_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4428ae24-f176-4983-b211-51a0ef7936d7/duvotomizomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db581ccf-1d09-4f9e-9b18-fb9c7a70a315/42537015268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5146245b-01de-4bf9-b492-b801ca809b40/does_walmart_offer_covid_vaccines.pdfIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_a10c6a93bba0480d8797f4feb29c1909.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5956e03-a16d-4202-9816-058064cf38b5/sql_server_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6811b983-8b5c-4b42-b429-7c3e28977b66/dewalt_mitre_saw_stand_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace77043-ee1c-45e0-8ac1-b279760ecf36/ripigikunupegalexa.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_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 5192 bytes
SHA-256: da8d39661b965f1d98005b519332883f3ccf1bf8f3ad4207359a53d08bab4262
font_01_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 10820 bytes
SHA-256: eba266feb6757c51919239f32ded037da78200e56ee64268fcb39fcf84221410

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