Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d58c33b87af371a…

MALICIOUS

PDF

82.7 KB Created: 2021-04-09 22:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f0f0210d79cf7be095de765c9f6f09e9 SHA-1: a2d77e46f9af81ffb7578bddee664a2b6059fbca SHA-256: 5d58c33b87af371a20c1da998385a81273816d3594793409097c7af9e8bc4dac
186 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 or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=what+religion+is+celebrated+in+japan PDF link annotation
    • http://hotloveme.online/descargar_diccionario_frances_espaol_gratisdyvq4.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/altivar_312_manual_de_programacion.pdfIn PDF document text
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/bda944d0815748.pdfIn PDF document text
    • http://naturaitalia.space/787733504962t4z9.pdfIn PDF document text
    • https://dupasaku.weebly.com/uploads/1/3/4/2/134235895/b4525ebf2224b67.pdfIn PDF document text
    • https://walisisatar.weebly.com/uploads/1/3/4/5/134576301/xunab.pdfIn PDF document text
    • http://xibiselid.medianewsonline.com/8274912709.pdfIn PDF document text
    • http://rivokalodusi.sportsontheweb.net/dagaxuwejuxiravibukano.pdfIn PDF document text
    • http://soinjaga.ru/wowuviber9kkg.pdfIn PDF document text
    • http://sallehub.xyz/how_to_fill_out_a_residential_lease_agreement54p32.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/df404e75-eeec-4f00-85d4-f4f37dc50021/xovekezes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29af6df4-da34-4336-86d9-228c46b2a119/12105653329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3574e63-c086-441a-b401-8445cd3d090f/93732776578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/437243b7-8d49-44e4-97d4-949d1c501fcb/msi_970a-g43_drivers_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/fiwudefetudazaxodura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffdd77be-2f21-4d3f-9a2c-45d48e754c17/where_to_get_electric_arrows_botw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2cc9a9-2fb1-45c3-b19e-342646385339/how_do_you_do_fractions_on_a_ti-30xa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09643b1-29d6-4e8c-94c8-add6931cee16/wutapefaguna.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/bible_app_niv_version.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/55575153921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f2d3637-4d27-40de-bab8-567d0eeab3a0/14040779101.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_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 5352 bytes
SHA-256: dacfc2e124911369db472ca0fa303f6771d13702f87afa5be4ec279d89283c75
font_01_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 11008 bytes
SHA-256: 8aaad7bdf8e3087a8c737d91a5c893d232483946d8346086716619e334e8aa53
font_02_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378