Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa17974ea7819271…

MALICIOUS

PDF

78.2 KB Created: 2021-03-15 17:57:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 27286a261e56d28cd37521e294bb8702 SHA-1: d1a6f7874ccc5e89a584736c42a83970045955a6 SHA-256: aa17974ea781927158d434e9f79a08f7995cedeecf70d6a163add51564954ebf
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. A critical heuristic flags an external URI pointing to 'jacksth.ru', which is likely part of the phishing lure. While no scripts were extracted, the PDF structure and the presence of external URLs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=short+moral+stories+in+english+with+pictures+pdf PDF link annotation
    • http://fewipawesedases.iblogger.org/employment_verification_letter_template_examples.pdfIn PDF document text
    • http://lnstagramverifycentre.com/66688396438qql2v.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/hgjbigX/sunemid.pdfIn PDF document text
    • http://prizinsta.online/72656211518zw5zi.pdfIn PDF document text
    • http://avlto.best/624390601252sjkp.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/kvjfgcN/94290872756.pdfIn PDF document text
    • http://ijmalan.xyz/kenwood_tm_d710a_specificationsxxqzz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://govujetimavex.epizy.com/48642301634.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/engineering_drawing_previous_question_papers_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/bogomuwun.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/vaxegoxulinawojubulebado.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/dusk_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/dorovujanojodejagur.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/ac_and_dc_power_supply.pdfIn PDF document text
    • http://tidokapisu.epizy.com/47562660581.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/72806212475.pdfIn PDF document text
    • http://tisilakifejil.rf.gd/how_to_whiten_teeth_in_photoshop_elements_2020.pdfIn PDF document text
    • http://nivigiwaragere.epizy.com/kagerikage.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/80745439760.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/28054266018.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_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 5764 bytes
SHA-256: 9dac0b681b0c29359e64c5cb3f3f37f0c6bb0eb0cbe61e67a562d873c3d561b4
font_01_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 10704 bytes
SHA-256: 0a4a74e5a06253c4e66e11d4040e9efe95b87a054efc0cdd8f27187550e7967a

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