Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a9fc62c7986d03…

MALICIOUS

PDF

73.5 KB Created: 2021-05-10 06:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2936fb64f272671a7f02b68b1afc1f83 SHA-1: ddfcf3d094a00c8c7c208485afa458f943bfc181 SHA-256: 41a9fc62c7986d039b6020488cf664e2e381d0ee3c81761c9f7bcbea61d0381d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=how+to+resign+as+a+trustee+of+a+trust PDF link annotation
    • http://tonemisi.medianewsonline.com/payment_contract_sample.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/95576402915.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/95338324693.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/bestiario_medievale.pdfIn PDF document text
    • http://imedo.ru/20902364123eils.pdfIn PDF document text
    • http://gagarinski.su/diwotagimapusapetijikexyauc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_a2e393147e2249f0b7af2f10c215efb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogunabones/bloodstained_ritual_of_the_night_endings_guide.pdfIn PDF document text
    • http://ditanumugagoma.myartsonline.com/59023734847.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_1e2fc93aff364b23ae5c4b074a052f38.pdf?index=trueIn PDF document text
    • https://d4e9107b-ea7a-46dd-9434-10729a3140ee.filesusr.com/ugd/2e3df4_2778396bfd1142d2a16d3fb1977a300d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/52396901928.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/simply_keto_simple_recipes_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/how_to_read_a_measure_tape.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/83088882769.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/55936367701.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/enthan_amma_tamil_album_song_free.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_858fb7b0a4dd44c08c9a8f25f8082d38.pdf?index=trueIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_5a2cf7d676e243ffabbe8ae844f1979c.pdf?index=trueIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_addef396c1c94a8683d8ff6cb0250125.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_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 4956 bytes
SHA-256: 7c1cdce7704219de2b8039d907016b216d7029233cc27a170e9d6e44349f88c5
font_01_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 10300 bytes
SHA-256: 71d03f8f16602ff9d698064b7ce16214c7126aa4c478bae219fde02f8a5e7295

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