Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8bf74159d58d45…

MALICIOUS

PDF

82.3 KB Created: 2021-03-21 05:23:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 567f88a80c00251e9a450b1c9e5a913c SHA-1: 3228672561dca776c5be3064f8bff32668b78479 SHA-256: 9d8bf74159d58d450499541a7aa7d19d81f4ef8e9d5dbc406921e2d5492f1097
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. One of the primary external links points to 'resalured.ru', which is likely part of a link farm or phishing operation. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of numerous external links strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://resalured.ru/award?keyword=les+amines+nomenclature+pdf PDF link annotation
    • http://nuwevabufa.mypressonline.com/que_es_un_producto_artesanal_y_sus_caracteristicas.pdfIn PDF document text
    • https://cdn.sqhk.co/toriwogadej/eljejbz/rupod.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/kabbalah_book.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/sample_balance_sheet_of_a_company.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/jdgejhg/icecream._place_near_me.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/71507429448.pdfIn PDF document text
    • http://bagezokazuraw.medianewsonline.com/vafibofanapo.pdfIn PDF document text
    • http://wulixiv.sportsontheweb.net/amsterdam_red_light_district_map.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/9900689048.pdfIn PDF document text
    • http://tatemegedes.sportsontheweb.net/47393540182.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/wozoxub/89454807581.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/alan_walker_song_ncs.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/wefot.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/pl_sql_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/53839412695.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_80fe7be769eb4de4beb65883addd6ce9.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_909dc0611ee6421e9b00167ccf975f49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zizene/sophos_bootable_antivirus_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/mini_dachshund_puppies_for_sale_in_fort_myers_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/38981250260.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/30299113718.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/ntnu_master_thesis_latex_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/gezemebuli.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/79849328131.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_85b047ddf79747c2aaff44cfddb3cfb5.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_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 5240 bytes
SHA-256: a3f5dd0f7168763e9001198c1e2a871f80e2790ffcd030055ec59ac87d1c4a39
font_01_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 12516 bytes
SHA-256: 5b8bfd3bac7389a77eb540307b90e6b631adfee9d6567ac69f886ec57cb14b8f

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