Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b8697c608784ea…

MALICIOUS

PDF

70.7 KB Created: 2021-03-20 12:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c14ad22d2cac263f4abf113ad90fce5b SHA-1: 0c653b0e6a77052b5041f8357f37c68d4596e34a SHA-256: c4b8697c608784eabe6b510b6f01ef4c38b7a82df5aabb5ad16e8cf41541ad3f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish for information. The primary URL, https://jumiwimov.ru/award?keyword=venkatrama+co+telugu+calendar+2020+pdf+download, appears to be a lure for users searching for a specific document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=venkatrama+co+telugu+calendar+2020+pdf+download PDF link annotation
    • http://austritkfa.com/more_scary_stories_to_tell_in_the_dark_downloadvbahl.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/mimogarogevarevidunenasir.pdfIn PDF document text
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/nijetowaromeku-lozuvibanaruwat-zikuselamewumiz-faramejokagav.pdfIn PDF document text
    • https://cdn.sqhk.co/zokonerozo/a5Jigd6/sebuz.pdfIn PDF document text
    • https://xuleminemixek.weebly.com/uploads/1/3/5/3/135333740/wetisuga_tomagof_nulojowomiduzak.pdfIn PDF document text
    • https://rovonowevon.weebly.com/uploads/1/3/6/0/136051941/64191b34edbbad9.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/risd_school_calendar_roswell_nm.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/tlgdhge/the_running_room_outlet_store_etobicoke.pdfIn PDF document text
    • http://rte-ita.fun/6374827199564p6h.pdfIn PDF document text
    • https://zulasiromeg.weebly.com/uploads/1/3/1/4/131453934/fumesigulewisob.pdfIn PDF document text
    • https://pufenenuboz.weebly.com/uploads/1/3/0/7/130738511/deroli.pdfIn PDF document text
    • http://puduvab.sportsontheweb.net/vunareke.pdfIn PDF document text
    • http://erogan-columbia.site/virus_hunter_2020_descargar_uptodown0oqhu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_79c08582aade4ffe9259588f832d1365.pdf?index=trueIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_e6eda98f129246d987a34031bc3f40fb.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_b742ef33ea4f4876ace2dd5eb19b9425.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_252b87fc4a8145b483f0ec845fc68869.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_off0000d61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61B 5692 bytes
SHA-256: 807535b6fbb47f94917a7cdea267963efb98b2b32307edb717789d148a211631
font_01_sfnt_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 10388 bytes
SHA-256: 8c9df0e25cf28dfa1d8c06249d1f87f39e0a14ecc8f164d5f291d746d9dac22f

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