Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f54b1d52728b9c…

MALICIOUS

PDF

95.9 KB Created: 2021-09-16 15:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02abf85521a7dbe2aad9b8666ffa04d6 SHA-1: 30660a3378b882bc78ebc3b51d13efdbf41042b9 SHA-256: 72f54b1d52728b9cad90904fe6b173f97e927123e8696409de82a0da14cbd7e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic findings point to the PDF acting as a link farm, with numerous embedded URLs directing users to other PDF files, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://sobateracota.ro/mm/file/79988103375.pdf In PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/gosuvalatutijewoxofutu.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/nijipepoterakapa.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/tulevusogafovada.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614057b8c7b5a---sejisoxafotidoweligojuko.pdfIn PDF document text
    • https://ayurmitra.com/files/file/kasikuxuwive.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/vozekifukikokekida.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/miwedovexokilazi.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/23884742761.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/xotegamaxujezobuk.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/naforokujasixotid.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/89655678897.pdfIn PDF document text
    • http://househouse.it/userfiles/files/sewodenunewesede.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210910185340.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/10411383354.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/72727411236.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/nekerimaniba.pdfIn PDF document text
    • https://ahha.az/userfiles/file/papomorebe.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/fomegabediguwuluvud.pdfIn PDF document text
    • http://sdds.be/userfiles/file/lowerevenijikalogofaro.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/xazevovefuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=super+mario+bros+2+gba+rom+free+downloadPDF 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_off00010ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F2 18724 bytes
SHA-256: 617092e29e8afa581c71f260941c16f6da0610c36d1a9f7979b829b6be2ed51a
font_02_sfnt_off000157ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EC 11264 bytes
SHA-256: ce82b6d4909ce0bb1646f64cce17f220de20603ac2e1ddf14779ea2f754ee9fe

Open this report in the interactive analyzer, or submit your own file for analysis.