Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dace0f753f0d6a8…

MALICIOUS

PDF

75.3 KB Created: 2021-02-25 18:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4a3dd62fdfa327ff628d86fc190ee2ed SHA-1: 538af231792784ab2aff8a9a033997e1a9a83e5c SHA-256: 6dace0f753f0d6a8679368e4c821b23f27ba76f78355cbee6f563da46c8be32f
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malicious redirection attempt. The ML classifier strongly indicated maliciousness, and the presence of external URIs points towards an attempt to lead the user to a compromised or malicious site. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/strik?utm_term=what+is+a+good+typing+speed+for+office+work PDF link annotation
    • https://pafetujesotizi.weebly.com/uploads/1/3/5/3/135348857/9234225.pdfIn PDF document text
    • https://bexejasofipa.weebly.com/uploads/1/3/1/3/131397997/529221fa9f3ee.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/67107003186.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/OaVYijN/zoteputobin.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/73312986057.pdfIn PDF document text
    • http://mon-fortuneo.best/how_much_does_it_cost_to_ship_200_lbsgizhj.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/vT1ifid/newborn_kitten_care_without_mother.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/nopigonexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_60343a6d6502c.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/planificacin_estrategica_de_mercadotecnia.pdfIn PDF document text
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/mesup.pdfIn PDF document text
    • http://letilemugemin.66ghz.com/american_truck_sim_apk.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/ganusox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sosefaxerutujax.rf.gd/pisatadixiwopavoza.pdfIn PDF document text
    • http://tosememab.rf.gd/rental_lease_early_termination_form.pdfIn PDF document text
    • http://pezaruzij.rf.gd/mopazamexojotimezo.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/descargar_google_traductor_ingles_espaol_espaol_ingles_gratis.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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 5656 bytes
SHA-256: 3fcf91c86107c1efb406a62ac19fa455e43f4efd720f8061401c6bfcbbd358c2
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 10620 bytes
SHA-256: a4b804aa20430495c89b7d35cba9dd097606f55570fc9862fe33898776faad8e

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