Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90e1fbd7d8553fe…

MALICIOUS

PDF

94.7 KB Created: 2021-02-23 02:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fb230ddd23d931d47bc9a03dfd0e336a SHA-1: e8ea11ca9d854c4bd9a4d935fefa3d3d9b4bd630 SHA-256: d90e1fbd7d8553fe2f639606bc30b3ee7b8fcc53f12231f18193ea2d9cf1dfd6
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or link-farm-like services, indicating a strong intent to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the document is designed as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=spirit+of+truth+and+grace+youtube PDF link annotation
    • http://labiosdewonda.com/716215748613ygfq.pdfIn PDF document text
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/berigozewoberis-kifekidesimul-wonesejopojaw.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/4082169.pdfIn PDF document text
    • https://natevifenug.weebly.com/uploads/1/3/5/9/135986161/tuditizalovep.pdfIn PDF document text
    • http://kismykeitio.best/9801424793428d5i.pdfIn PDF document text
    • https://doxefifuz.weebly.com/uploads/1/3/0/9/130969363/f408e8ee.pdfIn PDF document text
    • http://navalny.design/jugekozuzezemitozupgk90.pdfIn PDF document text
    • http://bellissimo.online/13401791472rw3ff.pdfIn PDF document text
    • http://yourbigdick.space/15235113625sufk1.pdfIn PDF document text
    • http://duwisodoginut.22web.org/online_application_form_du_sol_2018.pdfIn PDF document text
    • http://pufonorigaji.22web.org/40322041547.pdfIn PDF document text
    • http://canlisohbetim.net/sbi_ppf_account_application_formz6l3i.pdfIn PDF document text
    • https://revabusabozuvum.weebly.com/uploads/1/3/5/3/135398016/bivajapewivifof.pdfIn PDF document text
    • http://1xbet-football.fun/fesujakoxutekebukudmg8b.pdfIn PDF document text
    • http://torchqbfl.fun/xezolujaxu2gv9.pdfIn PDF document text
    • http://copyright-notice-ig.com/sigakupolafafazutulure3a3.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
    • http://sojurok.rf.gd/kupizewurematabelozunimop.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_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 5432 bytes
SHA-256: 027012c702af57be917615410baf83516cd65367def9609c3d5f3a001d526f80
font_01_sfnt_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 11908 bytes
SHA-256: eb5a15406dddc2cc568b354f0b87a96e5c1716a37a275e43c2558ac1ae477574
font_02_sfnt_off00015f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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