Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f9ee4026353a66…

MALICIOUS

PDF

118.5 KB Created: 2021-03-23 09:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bf0b59b5549b3076b9c5c3d789442adc SHA-1: acc469e1943db5a996c32a552de1d85b96e4a992 SHA-256: 55f9ee4026353a660c187f807a88c72c8b3d5fb09fe69bdf72eee355f4a7fd5f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One prominent URL, 'https://jottigo.ru/award?keyword=examine+the+biblical+meaning+of+sin+pdf', is presented in a way that suggests a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jottigo.ru/award?keyword=examine+the+biblical+meaning+of+sin+pdf PDF link annotation
    • http://tanolugulutewu.medianewsonline.com/fufajat.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/22293083330.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/48499044836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_604ae4c2da00b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_6008d8d685ee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_603e7fa283424.pdfIn PDF document text
    • http://nesarose.sportsontheweb.net/cours_bgp_cisco.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/31694381263.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/house_of_cards_line_dance_step_sheet.pdfIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/48999375958.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/25124269247.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/what_is_spiritual_authority_in_the_church.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/node_js_express_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/sentencing_guidelines_uk_assault.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_395ccbf008384d1bbecd0a554989a82c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/gospel_hymns_sheet_music_free.pdfIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_fde1116106fa4bc7af3d9275f8195851.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guxosa/what_is_the_name_of_gods_holy_mountain.pdfIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_7e121f11399444c68fd4b64bbf540691.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_553382f6d4244ab9b65083ec74d599df.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_off00018ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE4 5640 bytes
SHA-256: 6a2ca2474e7f19bdbcb7544c6b93dd0d42dfe9eb094c992e05f21bd54edf3c4a
font_01_sfnt_off0001a1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1F8 13052 bytes
SHA-256: 5212dbfa450922217cdb7ef243d88580f4fef094ee8bac3e3384e64d893597e7

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