Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbf46b78a640ed9…

MALICIOUS

PDF

75.1 KB Created: 2021-04-19 18:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d01d0b720e3a854a5888447a69a1835 SHA-1: cbd5747a44d11890fc9521f287e5b0aaa632787f SHA-256: 1cbf46b78a640ed9a51e2006d2b0e8f71a6d24cc17f5330a15638c08e42c4497
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of embedded external links, with one pointing to 'seumenha.ru', suggesting a link farm or phishing attempt. The document body is heavily obfuscated and appears to be junk data, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=tcp+ip+meaning+in+computer
    • https://famojiwogupoj.weebly.com/uploads/1/3/2/3/132303340/bfebaad4cdd.pdf
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/xaluloxogalefifa.pdf
    • https://mexupapomumag.weebly.com/uploads/1/3/0/7/130775103/9688301.pdf
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/voniramozaseled-wujozu.pdf
    • http://gratoramaa.space/super_city_version_1.172_mod_apkvqw1p.pdf
    • http://nopotaz.medianewsonline.com/assurance_and_insurance.pdf
    • http://netopodimamo.mywebcommunity.org/jaretido.pdf
    • http://sutovuresas.mygamesonline.org/76480331170.pdf
    • https://xekafifem.weebly.com/uploads/1/3/4/6/134669887/selibopibid-fixedolunagexo.pdf
    • http://meriline.store/34456118808ow3sq.pdf
    • http://zedakobogesa.mypressonline.com/cartoon_character_design_tutorial.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2df275fc-a8dd-466e-be95-33fe0afe7bed.filesusr.com/ugd/9b6d1e_78bf58eb93b844a7ab42363b32b52429.pdf?index=true
    • http://juwukopegonamu.onlinewebshop.net/vedekuvipimema.pdf
    • https://s3.amazonaws.com/dazinibonofobi/visefomamuboretirarigu.pdf
    • https://s3.amazonaws.com/viwoxuz/how_to_adjust_subwoofer_on_vizio_sound_bar.pdf
    • https://s3.amazonaws.com/pafexegud/how_to_graph_on_texas_instruments_ti-83_plus.pdf
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_349d668ed4aa4d938ae77de83ab65a80.pdf?index=true
    • https://s3.amazonaws.com/zunewidimem/lowikapapajifovajivobo.pdf
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_bd23b4a8db0f49a7942dcbe71c593889.pdf?index=true
    • https://s3.amazonaws.com/xuvamuba/oracle_12c_vs_19c_features.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e871.bin
4c0cf977086f4a0bbe9ed947aa7e9425e14452784079141a3424b67dfd64a828		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 4992 bytes
font_01_sfnt_off0000f95a.bin
b4a5de0737e99f3591f776b9f72febf776986fda5d4353fed96a86a90621a4cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 11184 bytes

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