Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae27df1cc2bc7337…

MALICIOUS

PDF

74.0 KB Created: 2021-03-23 11:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b632d78909a3742db65d4d01e6711d97 SHA-1: e74d90c798ae5254764c628c6f2da3cc008370bf SHA-256: ae27df1cc2bc73372b5d6306b13824271be4ace8b7a2ec7561aa9edd9683b483
96 Risk Score

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 'https://jacksth.ru/award?keyword=beneficiary+certificate+pdf', which is likely the primary lure. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded URI suggest it is designed to trick the user into downloading a payload or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=beneficiary+certificate+pdf PDF link annotation
    • https://cdn.sqhk.co/divoxisig/ajdujdS/58110485295.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/fhfgeRD/xisajujit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_6053c3ad18d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_60260af1bb4d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393033/normal_5fffe74a9b175.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/wiagghd/vipapejixopikaz.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/angle_pair_relationships_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419002/normal_6028126d18bf5.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/84074816571.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/83bf500f-11ad-4e8a-9f3a-a4b4ea066b19/91881330289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42864f3-ed21-44a4-bc73-f0bf7f9c42a9/walmart_black_friday_nov_27_ad_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/domijixareka.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/vuvajezuxosija.pdfIn PDF document text
    • http://xonolori.atwebpages.com/linibakakezuwaka.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/bavibarixikivajujit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60762cc-850e-422b-8ada-a1ae9c72c468/how_to_open_microsoft_sculpt_mouse.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/89752309589.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/owasp_cheat_sheet_series_github.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/7824707399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a814f1-d58a-4b37-aba8-acf2e9ad80c8/95322483503.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/rorulizerotil.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/75754806358.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/dovujitoxireletofipiz.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 5088 bytes
SHA-256: f66d93425ac128a0ed7c88bdedfc7ec7571487de7dd151d092b1a31185a9a189
font_01_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 10800 bytes
SHA-256: 69e4126f22be6c7950da8403955be3d33d75e36f563861909c16dcf3eceecec9

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