Malicious PDF — malware analysis report

Static analysis result for SHA-256 70732cc55f9cb63f…

MALICIOUS

PDF

87.5 KB Created: 2021-03-19 08:09:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cfe570a1706e34f15e905f6bf94c88f0 SHA-1: b6b625e6bd02b12e001010a052d3500b1356f954 SHA-256: 70732cc55f9cb63f8dafa14ebce93cdee7f264277a3fd8d598efd0766c5d00e4
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nipisod.ru/123?utm_term=brochure+template+flyer+design+vector+background PDF link annotation
    • https://jotozured.weebly.com/uploads/1/3/4/5/134588142/vovedeti-misakuserizul.pdfIn PDF document text
    • http://malespw.xyz/how_to_use_samsung_s8_as_webcamx3cm0.pdfIn PDF document text
    • http://sportplays.ru/zukemizedonuvejagzo9w.pdfIn PDF document text
    • http://vas-rem.ru/foxuwiwezi93ahv.pdfIn PDF document text
    • http://front-glass.space/residence_inn_north_conway79idc.pdfIn PDF document text
    • http://digtalcaliper09.xyz/how_to_get_mewtwo_in_pokemon_crystal_clearggv6c.pdfIn PDF document text
    • https://nezejigon.weebly.com/uploads/1/3/4/6/134611081/didivasilefo.pdfIn PDF document text
    • https://nopumalazaf.weebly.com/uploads/1/3/0/8/130813483/gifomitifiwu.pdfIn PDF document text
    • https://bonosojemigapa.weebly.com/uploads/1/3/0/7/130776366/galukixamipog.pdfIn PDF document text
    • https://sadepejeriroxet.weebly.com/uploads/1/3/5/3/135337628/kowiwajajaroxero.pdfIn PDF document text
    • http://idclick.cash/meridian_phone_system_customer_service3sjyk.pdfIn PDF document text
    • http://nyvelsets.online/duvibubivomojukackngr.pdfIn PDF document text
    • https://nikovazof.weebly.com/uploads/1/3/2/6/132682709/2994700.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/dijazaxusu.pdfIn PDF document text
    • http://oneitstore.info/rabesumaluzenilojdlkcv.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/71064c4d-a749-4aeb-84d8-103a1621eac6/madimalutabez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c65c1c-6c0e-4a5c-9425-edfc1ffea91c/left_handed_ukulele_chord_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f641b59e-88d2-4ffe-8e79-519127379b7d/medinidewowunofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/912cbd53-6e07-4ba7-94b1-7643b8f39da9/who_made_up_the_2nd_estate_of_pre-revolutionary_france.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb8a676-1195-485b-bc81-a62993a75ff0/kusasesawikapizosari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd7b37e-784f-4285-9c51-1eb92f93f6ad/anti-inflammatory_diet_101_how_to_reduce_inflammation_naturally.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29ead28-8081-48bc-b157-e5165998b718/nabuzex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d9a538-842a-4acf-9e2c-244217ffde21/saravexelitumupitixafix.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_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 5984 bytes
SHA-256: 16d9d3b33250a41b0005e94ff1d91ad912e1c448b3ca1029eeb2b68a2d4f0bb4
font_01_sfnt_off00012974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 11316 bytes
SHA-256: ffcf7639079ec7291db5cb2a438d93862c80b5536323cca7ec274b7366f30bd3