Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fc435a0474d963…

MALICIOUS

PDF

94.5 KB Created: 2021-09-21 17:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 251d3488b0113077acd3e07b16d420da SHA-1: c512ac4b4249bb9453401144842fef6b73a35157 SHA-256: f4fc435a0474d963a20404432c44dd20c14d304347b46d648bf1def3993edb64
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs, with several pointing to potentially disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of many external links suggests an attempt to direct users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oniceh.ru/uplcv?utm_term=hero+of+sparta+2+ipa PDF link annotation
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/2981056546.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/ragijuwopevafudajawala.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/27401301448.pdfIn PDF document text
    • https://mehregancenter.ir/images/upload/files/kobumowisaromuxezupudunu.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/83458826744.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/83209280736.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/34098369831.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/fapewaze.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/28184485539.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/pibanefazokozukuraneparup.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/27822945787.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/59349138884.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/44693323770.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb35b45508---nalowunenezep.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/45612302900.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/farolejolojepavomipotat.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/zumomizoduzi.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/ropafidu.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/sodadavufe.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/35250124210.pdfIn PDF document text
    • http://intertribo.sk/files/5153176524.pdfIn PDF document text
    • http://gestioniarmatoriali.it/68435982970.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/24244598701.pdfPDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4d96a060---5937527944.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_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 21648 bytes
SHA-256: 972598bb4b772636093158298393ba886477edde4dc8438609106f58aa9f5f87
font_01_sfnt_off00013d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D04 10312 bytes
SHA-256: a2c82fbbca73e078e18f7f728d8b87285506955b1eccfe8b36eebd263c0ddfac
font_02_sfnt_off00015475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1