Malicious PDF — malware analysis report

Static analysis result for SHA-256 563d8c92030ed128…

MALICIOUS

PDF

71.9 KB Created: 2021-09-24 22:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a17a940b9a5bef76a6440fb22fd6bf7d SHA-1: cba14df506a74a51fe33f5e50d4fa31c9b0b7c7f SHA-256: 563d8c92030ed128bf9460fb74f63428472d774b39e26454d14ad8c2d114fc7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a strong intent to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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 http://myucpb.com/userfiles/file/lidirabozefonigowutekut.pdf In PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-08-02-58-26-55.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161475647871e1---25571355994.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/87184006605.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/zefavafonivev.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/49514930446.pdfIn PDF document text
    • https://durimawar.com/contents/files/88322161864.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/820974080.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/56106841380.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/60091236728.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/41971465683.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/wugetu.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/buxenapi.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/57069194920.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/meger.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/4383569842.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/29340707070.pdfIn PDF document text
    • https://etadelloro.it/images/file/58360176298.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/gabaxozaliko.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/8006984429.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/pawoboketetikal.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/38070504128.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/muvipubibulepiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=can+we+connect+mobile+to+smart+tvPDF link annotation
    • 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_off0000b4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EB 17248 bytes
SHA-256: 2a1ba6c5c68d8cb9167eca0de6c2b23736178d9c4f8e74361818fbdcbb9844be
font_01_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 10712 bytes
SHA-256: 8c170070d944bd350aec0ebe3b30c1124bccba2bab573147a630b661365e75bf

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