Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e5fb3ef44733c6…

MALICIOUS

PDF

101.3 KB Created: 2021-04-16 19:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b9841a1863d41e06ad337d80be82eb72 SHA-1: ceef016fca1dcea49b560b0686371add8e6c3f3c SHA-256: 57e5fb3ef44733c6e465aa6f4c960d4d07cb0e6916a489164bf8573bb08c835e
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 domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://xajibur.ru/strik?utm_term=how+to+seduce+a+woman+through+mind+power PDF link annotation
    • http://5coupon.info/59640605147l7blc.pdfIn PDF document text
    • https://jijemelagif.weebly.com/uploads/1/3/4/0/134016961/sexizudulu_lemedixo_mabetojorale_forufapatekonem.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/vlookup_and_hlookup_in_excel_with_example.pdfIn PDF document text
    • https://wijununag.weebly.com/uploads/1/3/1/4/131438003/54e32f7db.pdfIn PDF document text
    • https://nabezaxe.weebly.com/uploads/1/3/4/8/134852032/papedo.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/8695554.pdfIn PDF document text
    • https://kegotewu.weebly.com/uploads/1/3/1/4/131437679/5164194.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/68de751a6.pdfIn PDF document text
    • https://varigero.weebly.com/uploads/1/3/4/4/134443598/selibofafama-goxir.pdfIn PDF document text
    • https://pufenenuboz.weebly.com/uploads/1/3/0/7/130738511/nigixozexinapovove.pdfIn PDF document text
    • http://vinnipoh.fun/82260626906s9faf.pdfIn PDF document text
    • http://teren.fun/lost_in_the_taigau035q.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://uploads.strikinglycdn.com/files/a27cf6a0-0767-481f-910d-90b571bb31ab/dukarezogova.pdfIn PDF document text
    • http://lukafimagog.atwebpages.com/jazurakamanoneforupor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4293ac71-3932-4e48-b8d4-63b740a45d5b/frases_do_livro_alquimista_paulo_coelho.pdfIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_0fca95a73d534cf1be5cb1490104e162.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8bf7446-8cf1-479f-bae0-730707351482/how_to_change_my_keurig_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/336b5622-842e-4c99-952a-eeb857daa70a/ribudamimewugaxoxedam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453bb1d8-e51d-4d42-a4e7-cc72e90b9947/50071650559.pdfIn PDF document text
    • http://robefowoved.onlinewebshop.net/nofita.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_102707411d0b44d8bedea8a396f96525.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_ce0f1286d7b341c08c2419a32c90b6a8.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 5388 bytes
SHA-256: 183e5b0474602473ed63b7e6a079b01d93af362113af5b00657679fceb0d48a0
font_01_sfnt_off00013ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA8 11032 bytes
SHA-256: 0d79fadc694d2f8ea043e6c8c200f12d1def1cae0d78f8207c7d66af53633b7e
font_02_sfnt_off000164b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164B4 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330
font_03_sfnt_off0001794c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1794C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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