Malicious PDF — malware analysis report

Static analysis result for SHA-256 8521e9742ff9f987…

MALICIOUS

PDF

76.3 KB Created: 2021-03-08 10:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0f295485c992442670279f07a5bfbbc1 SHA-1: 19e9fa977336760b1ec989da1a037cebea67a466 SHA-256: 8521e9742ff9f9872c6ad64dbc177c1aadbc49e1a54bf9a1a6c09ddbca8a61b2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, contains text suggesting a 'thank you and goodbye letter' and references wkhtmltopdf, indicating it was likely generated programmatically. The presence of multiple unknown and potentially malicious URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=thank+you+and+goodbye+letter PDF link annotation
    • http://jiresumojunivup.22web.org/84178744325.pdfIn PDF document text
    • http://tumibejum.iblogger.org/netflix_expired_meaning.pdfIn PDF document text
    • http://supexevibune.22web.org/8262433773.pdfIn PDF document text
    • http://zebarugusi.22web.org/ruwugadijovawujumosaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/debiwelof/gujomoxatimizejixemuke.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/couper_son_video_android.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_91b22423b902432883aba9e0bff1d925.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_debd80755bbc45679339f8570d79b421.pdf?index=trueIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_b7671bde42fb4bcaa52f3b286d343059.pdf?index=trueIn PDF document text
    • http://rajokawaxes.rf.gd/how_much_do_forensic_investigators_make_in_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/emulator_ps2_kuyhaa.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/kalender-_uhrzeit_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/zero_conditional_in_reported_speech.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/83238147262.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_1c2a73790a7348eb8ce32a5562792d81.pdf?index=trueIn PDF document text
    • http://tizaxamadifar.epizy.com/comparing_and_contrasting_texts_lesson_18_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/bar_androides_barakaldo.pdfIn PDF document text
    • http://bojonovaja.rf.gd/boutonniere_deformity_surgical_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/54097530247.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_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 5164 bytes
SHA-256: 0ce93b9dc9e0127440434feff6ca4e336af288d65da1c704e40017cda383f67f
font_01_sfnt_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 10452 bytes
SHA-256: 976592fe645555b98763f779ae3779524c2c581c31007c898b0c4983ba2ff291

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