Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cde5305f953f872…

MALICIOUS

PDF

85.6 KB Created: 2021-03-12 01:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bd3ced537b0f3d2e42e542bbed3da5fc SHA-1: 876a3cfa9172afbd175912b02950629987c7fc14 SHA-256: 9cde5305f953f872faff5cbcc3c9fa7a4eab79f2c1c9671ef8244808f842d425
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, identified as a "PDF SEO Link Farm" heuristic, directing users to various domains. The primary URL, https://mezovuduw.ru/award?keyword=noida+master+plan+2020+pdf, suggests a lure related to a master plan document. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked sites.

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://mezovuduw.ru/award?keyword=noida+master+plan+2020+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5fcf5ffdb99df.pdfIn PDF document text
    • http://ingmijn.com/buwolasaruxuxomadieivj9.pdfIn PDF document text
    • http://persequen.com/what_is_the_best_rainbow_six_gamedl003.pdfIn PDF document text
    • https://zumusikibalagop.weebly.com/uploads/1/3/4/0/134096359/nadoguv-silevanar-samapibufaru.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/9403e6bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_6013be3fdc347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482869/normal_602803561da96.pdfIn PDF document text
    • https://ruwevupezo.weebly.com/uploads/1/3/4/0/134013147/javusuvudafuj-sunukujanutafo-navorepoxogawi-jemivabaf.pdfIn PDF document text
    • https://xanuvewetarew.weebly.com/uploads/1/3/4/7/134732967/66e86fb94c87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_6015ab626a85f.pdfIn PDF document text
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/xegazuz_fazot.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/pumovoska96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_f57ad504036c4f638d636d3eb1320f46.pdf?index=trueIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_388f7f91ed6c479295f6db17ee22ae32.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_0daf014393b34584b7c376764f1aec17.pdf?index=trueIn PDF document text
    • http://zimedexi.rf.gd/food_brochure_design_psd_free.pdfIn PDF document text
    • http://maviwapas.epizy.com/3985870708.pdfIn PDF document text
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_4b1b10daaa4c4874a4ba760c11b0e39a.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_40993087af3f4020ba0a5fe938c2aecd.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_cbdd02226e3b46e7931b4e465971c026.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_49e7e34b915b4d2f9369bf84ce94e8d0.pdf?index=trueIn PDF document text
    • http://lesodabat.epizy.com/conversor_gramos_a_miligramos.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_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 5432 bytes
SHA-256: 5c267d1036e529ce8da7d5028152ca744e627ba1214d37e6a519ca385b1230ba
font_01_sfnt_off00012599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12599 10472 bytes
SHA-256: 765fa2fbe5e311cc81960b14c08ca0ce7695511cebd5490ee39f1a6b3e3786ee