Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80ce0b57b10bd3e…

MALICIOUS

PDF

81.2 KB Created: 2021-03-22 23:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c352fc23db6e81d7d70c86997f6dd896 SHA-1: 8999f896e0183ebbae25ba33330a5d9549b44555 SHA-256: c80ce0b57b10bd3e52c1e2082b233a803bb897b5b43c8336a4ce605e8cfadf54
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, references 'desercion escolar en mexico 2017 pdf', likely a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=desercion+escolar+en+mexico+2017+pdf PDF link annotation
    • http://sevezor.scienceontheweb.net/nozulejag.pdfIn PDF document text
    • http://raisinshq.club/64262098866p8xse.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/nixupitodilin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_5fe73ff29069c.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/zuwijarpi2hw.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/rosowarijizalupuvi.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/steam_boiler_specification.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/buzasodawume.pdfIn PDF document text
    • http://medemukiduba.sportsontheweb.net/what_is_organisational_behaviour_and_its_importance.pdfIn PDF document text
    • http://ogranicbio.fun/3237924443zbaq9.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/1280104759.pdfIn PDF document text
    • http://fetedeju.mygamesonline.org/sutiguwikizanasogiviwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451941/normal_600271b76bd9c.pdfIn PDF document text
    • http://pubgmobiie.com/high_standard_sentinel_deluxe_r-106_value30svf.pdfIn PDF document text
    • http://firstreadersclub.com/how_to_service_echo_leaf_blowerdri6v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_6023b98e05a52.pdfIn PDF document text
    • http://sepozimog.scienceontheweb.net/disneyland_california_map_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_76beb94f14ec47498fd34809384c1cf0.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_8cdc0cb2571e4e81b1f50db1060b3cc7.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_5e80d84ae1734cea8bffb8da50f89c4a.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_e3d717c40ef04b219c379bd708d8d02f.pdf?index=trueIn PDF document text
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_508d15b50a154643800a90251ebff282.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_2f688b5a069947d994d0530c0e4818bf.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_d2a3dbf090f94e27a93c39137f2da530.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_ad85678b54434587b45e348fabec863a.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 5776 bytes
SHA-256: 7df3cd66562d558922b8a35e6c2e83f8a4e9ceef60cb9a1f4d9b43b743b5966a
font_01_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 11380 bytes
SHA-256: 97ee0b056a9dcb224ae60e7f9040b4668b5aad4f8782d470510e2055dbb98c32