Malicious PDF — malware analysis report

Static analysis result for SHA-256 755c6a52c463d829…

MALICIOUS

PDF

81.8 KB Created: 2021-03-22 12:38:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 79b29b34fa2824ea410b31d3cbf8419e SHA-1: d47c2ca531a7142cb3972f5f2ffa7aea4ca39eb5 SHA-256: 755c6a52c463d8292f44b9c2aa770b6050e6624057b0006f763944fab5644521
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a large number of external links, suggesting a link farm or SEO abuse. One of the primary external URIs points to 'jacksth.ru', which is likely part of this scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the linked content. No scripts were extracted, but the PDF structure itself is used to host and link to external resources.

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://jacksth.ru/wix?keyword=where+is+carnival+celebrated PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379046/normal_5ff7a5a0555f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5fe63f164150c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_6029cd87347e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_603711c94c103.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/61606860483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376098/normal_5fe51d688c8a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5fd1fc0b1afa4.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/milajepajitovunezup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kukupunopedon/baravugumulurakale.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/trombone_shorty_buckjump_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/jet_plane_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/what_are_the_main_five_languages_of_love_test.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_e7624519354a4459b1201f119b86b781.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/9843947999.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/zukodadixuxejidelinugadub.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/ratezo.pdfIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_42325daaccae439298d16e13f8f59475.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/how_to_be_miserable_download.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/naxunibopimigexep.pdfIn PDF document text
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_cb569523f0a2424c85e30ea0f049ae59.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 4920 bytes
SHA-256: 446007565810a117c98ec68c2db70e32418baa06d5259bb87a0deceb033f2b5e
font_01_sfnt_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 11500 bytes
SHA-256: f833883932613d24b17feade85de0f3f413a9e45839a0ca47696db61775a3c4f
font_02_sfnt_off00012c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C32 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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