Malicious PDF — malware analysis report

Static analysis result for SHA-256 73dbbb9ea36f8d0a…

MALICIOUS

PDF

79.6 KB Created: 2021-04-07 18:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 02bcdceefab8e619a77b9a21ef1fc0cf SHA-1: 89b8d5baf67d190e1c3a538c75996c3bf4a3214f SHA-256: 73dbbb9ea36f8d0ac0c1aa59ae1b4637228a7a2e315f73b4ba326007bf13d5e1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=lung+cancer+journal+pdf PDF link annotation
    • https://cdn.sqhk.co/likunubiba/j6hcpib/hotel_panic_button_laws_california.pdfIn PDF document text
    • https://toxavikosas.weebly.com/uploads/1/3/4/4/134437834/497e7106e4a80.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/07cdc1af362971c.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/7401678.pdfIn PDF document text
    • https://nezuvaju.weebly.com/uploads/1/3/0/9/130969963/vivedosokabonavud.pdfIn PDF document text
    • http://zomusip.iblogger.org/lovunopeninilu.pdfIn PDF document text
    • http://ligoturup.22web.org/69666554533.pdfIn PDF document text
    • https://cdn.sqhk.co/dutigimomana/jZCQihe/boonton_public_schools_salary_guide.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/nagudo/87373036267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24270eb-4aef-4dbe-a8fa-957ebea3583c/migavewez.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/92937746625.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/how_to_fix_monster_illuminessence_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/wavoxasotebilipilagavut.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/anaconda_telugu_full_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f460a9dd-cbfe-4d2e-ae28-86429ed18fe1/32418091073.pdfIn PDF document text
    • http://fukijudetoj.epizy.com/kogesewotovesepiz.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/didopalanilazulopawo.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/16263969015.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/adding_quotation_marks_worksheet_2nd_grade.pdfIn PDF document text
    • http://jefesati.rf.gd/marksheet_of_class_10th_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e1638e-90b6-4236-8bdf-b48c59305707/77107785020.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_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 5160 bytes
SHA-256: 82e08445422da6d49308a6fe9cd7405671a197f954c03e736653645839d51c32
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 11316 bytes
SHA-256: e2c90e61836bd5ae60014f6bd13c84157797232754d89d5d1531e8b3f8523cfd

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