Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd221ff0a4e0b932…

MALICIOUS

PDF

197.1 KB Created: 2021-02-27 01:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 773404c1233c6d9ecf925d902b558aa5 SHA-1: 3a888a67b0db0531822834f62f11de4b58df7785 SHA-256: cd221ff0a4e0b932c20b878cf99046557adc89dc8447091f608f440ba1d51bc1
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used as part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to Jorge Luis Borges, indicating a targeted social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://leonvi.ru/aws?utm_term=jorge+luis+borges+biografia+obras PDF link annotation
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/zotegusu.pdfIn PDF document text
    • https://sefovajeve.weebly.com/uploads/1/3/0/7/130775607/jujamozenewaselital.pdfIn PDF document text
    • http://ttop-shop.com/salupuomcjr.pdfIn PDF document text
    • http://deutschebank-meine.com/fifus6gidl.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/vevapewilujuwuripala.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/9959174.pdfIn PDF document text
    • http://fastpeysistem.online/ruvedidilubewaboziraviwomc8uan.pdfIn PDF document text
    • http://winfreeiphone.xyz/sowigagatimanazukevufc130h.pdfIn PDF document text
    • http://sberin.xyz/agent_orange_vietnam_wartcadq.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/tevomenil/apsc_2019_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/archicad_18_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/screen_capture_tool_for_windows_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/disifuxaraterexokuso.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/zorubipizagovujosaz.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/busy_busy_song_ming.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/27437156316.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/free_printable_handwriting_worksheets_for_1st_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/who_is_the_new_miss_usa_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/febox.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/jorowoze.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002bac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BAC9 4760 bytes
SHA-256: bce0bc2f6075f4e06ce563c35e61fdb79e348441795ab363dd0b7e4ee5a5cb7c
font_01_sfnt_off0002cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CB05 14472 bytes
SHA-256: dd8df63e5d9a84c27ba33f0c16eec3c7e6f5c1b2d2ced373a64b00d9ca71382c
font_02_sfnt_off0002f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F64F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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