Malicious PDF — malware analysis report

Static analysis result for SHA-256 a952ab3bb0080313…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 15:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2748b02f7a59afbdb9040877b183c0a9 SHA-1: de0fbd6d4983003510692f7f4f3476c2614ed8d0 SHA-256: a952ab3bb0080313f0da591469cd5cdf62a5104cf583243c949b1942ca0abe9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous external URIs were found embedded within the PDF, many pointing to disposable hosting and utilizing UTM parameters, suggesting a phishing or malware distribution campaign. The PDF structure itself is indicative of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=sonic+4+episode+1+apk+mod+all+chaos+emeralds PDF link annotation
    • https://siam-royal-view.ru/data/files/wisanafuwowesizuvo.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/gizule.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/bopilekodokufuvan.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109112116575459.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/37362964805.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/xajaxebenapu.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/borazirulonu.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/mobinamiponesi.pdfIn PDF document text
    • http://lagrupacio.cat/file/kigamumaziwoxusutikoredak.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tofamerenisifemepab.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/69469557333.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/56064209479.pdfIn PDF document text
    • http://ty-int.com/files/files/77951005720.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/65348686940.pdfIn PDF document text
    • https://aromamarketing.md/img/files/34607044778.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/35368196297.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/fepofopugex.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/xaxupasax.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/28077146551.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/27316845971.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/49885568636.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109010552238683.pdfIn PDF document text
    • http://nincity.de/inline/file/54776739386.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381df925567---valivimugote.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/58223415224.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 17032 bytes
SHA-256: 00aa4f7d3eb88b648379a8c159a33dc28d06343b92affc966abd334127ec8d62
font_02_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 10976 bytes
SHA-256: dfdbe3275d1283512514eeee36912c2b0bc68e2bc342271fd08651eb1f6a12e6

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