Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5eedccf11bbe28…

MALICIOUS

PDF

81.8 KB Created: 2021-05-06 01:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cd51cd93575992f77a6c8ae804465d35 SHA-1: 1b9d07f3c188320ad32a28885b9f183e8ae343a1 SHA-256: 4b5eedccf11bbe28381399a55018d11814cdb707314728700bf1c24b6f5b470e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://crophysi.ru/strik?utm_term=my+cloud+review PDF link annotation
    • https://cdn.sqhk.co/zibumimuw/ii1gfhf/gowuvaje.pdfIn PDF document text
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/giluleleneni.pdfIn PDF document text
    • https://repitosa.weebly.com/uploads/1/3/2/6/132681506/tasid.pdfIn PDF document text
    • https://cdn.sqhk.co/denidugabuni/jclyUhi/wabobebuzanejisesexab.pdfIn PDF document text
    • https://cdn.sqhk.co/bozomixega/Kmtdhj5/9136262023.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/Uhegehh/73548289956.pdfIn PDF document text
    • https://semototip.weebly.com/uploads/1/3/5/3/135386148/5567444.pdfIn PDF document text
    • https://juliraviwuziw.weebly.com/uploads/1/3/4/2/134267057/wikudiper.pdfIn PDF document text
    • https://modemogip.weebly.com/uploads/1/3/0/7/130776314/motukonufavalubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_f8a0350f405743d09b087b90d099278d.pdf?index=trueIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_3119b58ba1ff4899bd03ab1e024e2536.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_07e1d18e11234a0798bc5563357b3df5.pdf?index=trueIn PDF document text
    • http://tosivasode.epizy.com/kolmogorov_probability_theory.pdfIn PDF document text
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_534d89aca632461fbd0598730d1c6fe8.pdf?index=trueIn PDF document text
    • http://mokineso.epizy.com/97243466746.pdfIn PDF document text
    • http://gizagew.epizy.com/51280349662.pdfIn PDF document text
    • http://fofebur.rf.gd/fifa_ballon_d_or_2020_voting_results.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910ea27c-5718-4e68-8b33-a9145f22945e/25785091104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ed91fc6-4cd7-4a56-bd0b-d8d6a6db0dcd/viladufav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4fbafd-afce-4dfe-84f8-aba4326d1a78/on_the_milky_road_full_movie_watch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46d2dea-189c-42ab-a832-0e9c3df0f05d/how_to_reset_telstra_technicolor_modem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe1e5b2-8e09-4c22-a6d7-7124d67343ae/42628967248.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_f31b5a36d2d542b5a3d13618558eb726.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/015acebf-032b-438f-a914-4b083dc428eb/ilive_hd_sound_bar_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b24fbe-a7ec-4d6e-9379-0608accdb29f/33088726139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad4952b-6d22-4b0e-93a1-fa737c1f0147/79579970326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742a4083-1d4e-4f34-8ae7-1a156ffa9e66/mn_drivers_manual_chapter_7_and_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7900da-1f57-40af-854a-61618a1c8795/87045228538.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 4500 bytes
SHA-256: faa3348a7a89233f7edac6a6d70f31f4b97afb00f8dc42acaa6b110a2824de5e
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 10816 bytes
SHA-256: 1e466783a9bf431a41eb7eda266d39b91a9854866e17ddf5a18de42e645bebdb
font_02_sfnt_off00012a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A05 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3