Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b410bcdf9aa872…

MALICIOUS

PDF

81.8 KB Created: 2021-03-17 05:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 59bff0e5fc1bf100212e6234738e903c SHA-1: a4798a77cf18315c7812db0f87f540bec0585a0a SHA-256: 68b410bcdf9aa8728cfa550cbceb0440cdeb211bc94908511c24ef4c647a923c
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'jacksth.ru', which is likely the primary lure. Although no scripts were extracted, the presence of an external URI and the nature of the detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=rails+activerecord+query+cheat+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456705/normal_60197a53ed0d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489981/normal_602b62527e57a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_5fe58c98bfb0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_6013260918937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479214/normal_600a582391f45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_603516024e3b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_604a5988dda56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_604e44d6afebd.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/sefabe/main_khiladi_tu_anari_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/61582116563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eabb1db-a205-43f0-8c5e-52d9a5ac155d/32935538590.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/68502506572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77951ca-d4fd-4e89-909c-629447982ee5/500592243.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/lightroom_tutorial_app.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/blaster_ball_game_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/46517330557.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/51585756114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f151dec5-b5e0-4049-9b3f-3e59ff144b74/dilopaziwipiwe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 5100 bytes
SHA-256: d5f0cf10a321bfa674c8fa5f1789f17efac75e9604a2c9377de442612422c399
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 11188 bytes
SHA-256: 7a0b9a2904c35416e991ce81506069b4fa6e2e088d6e73a6575b650c91ccc29b
font_02_sfnt_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
font_03_sfnt_off00012b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B42 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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