Malicious PDF — malware analysis report

Static analysis result for SHA-256 829b4ce35774da37…

MALICIOUS

PDF

80.9 KB Created: 2021-03-11 10:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ec6aa0077361746f4070022b33836c7c SHA-1: 3590a493bd5364c91a0b5a6bc221f54cd507b502 SHA-256: 829b4ce35774da37848d705ce9b5413b97cef6213dae1d7908a2802e0debafc3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/award?keyword=logical+thinking+exercises+pdf PDF link annotation
    • https://zezojafoxivofed.weebly.com/uploads/1/3/4/5/134528913/fab368b82126.pdfIn PDF document text
    • https://rawitexebava.weebly.com/uploads/1/3/4/4/134487877/529913.pdfIn PDF document text
    • https://mavuweginu.weebly.com/uploads/1/3/2/6/132681431/fijurugemamagep-kizetige-pizatalilop-pumaku.pdfIn PDF document text
    • http://sagokorize.22web.org/16936349693.pdfIn PDF document text
    • http://nilofebep.iblogger.org/aila_aila_audio_song.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/3021daf89.pdfIn PDF document text
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/55e00c667db8bc8.pdfIn PDF document text
    • https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/kovubadoku.pdfIn PDF document text
    • https://jagaruwej.weebly.com/uploads/1/3/0/8/130874180/kejeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_b3a6557f413b402e9c38d40174ceb253.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b37c32-fbdb-479f-99dd-0ce8cf8b91fa/himno_nacional_mexicano_completo_12_estrofas_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d36b85-d51b-412e-a774-7f7ea2b4050e/sony_ericsson_mw600_manual_espaol.pdfIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_6b94e16b03cf463a893e87d9e3271400.pdf?index=trueIn PDF document text
    • http://xivefasojag.epizy.com/calendario_laboral_barcelona_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/deled.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/what_is_the_average_power_dissipation_in_a_series_rc_circuit_if.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_f790b6469d594ecd9f5e015df3f55673.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_e5b776ef0d8f43b3af6e2cac1b1debd0.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_7db539d94d3e4f798d5f611c466a162e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d008b4d9-2488-4e23-b8dd-508d6c2cfaa9/big_fish_grill_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9caa93fb-82ff-493b-9a05-8b997ece418b/girunosoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd9cc0d-ebf1-423c-9612-7f8b7418d6d9/2012_honda_odyssey_transmission_fluid_drain_and_fill.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/renawifavugufatin.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/how_to_size_a_heat_exchanger.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/32027652058.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_off00010023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 5492 bytes
SHA-256: 9c3868e89ecf5d6fdd8c7ed3c306f20c1684a401dbc27c1c5e8457736ec31422
font_01_sfnt_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 10420 bytes
SHA-256: 336dc03f92ec0e00a06699b7964f9b1eaf66faf660198949cac676d65d4c6e12