Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89988ecb08b8768…

MALICIOUS

PDF

74.7 KB Created: 2021-05-09 07:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 240ef5a86aa94f068df7bdd944fe5827 SHA-1: 22c60fb35607b120bb262528431a530702d4ec74 SHA-256: d89988ecb08b87682bca745a48b3e8148d94234213aef3201faa26e030d13d89
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with several pointing to unknown or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=how+to+drain+a+portable+ac PDF link annotation
    • http://esplus.pro/38410598112mjf1c.pdfIn PDF document text
    • http://cpskras.website/what_happened_to_oliver_in_the_dark_knight_returnslrrql.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/jhghidk/kodi_build_for_xbox_360.pdfIn PDF document text
    • http://reduslim-europa.site/vowonamelaukyfw.pdfIn PDF document text
    • http://usacreditmonitoring.info/adobe_creative_cloud_stuck_at_697ptx7.pdfIn PDF document text
    • http://zujewap.mygamesonline.org/zazamakimaje.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/amce6et/segaviwifi.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/gOiheid/vipakuduxenusure.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/bajon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_fa2bdf44bc6941c8bd3078fc91879315.pdf?index=trueIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_42621a42180940168949b9b138cf1249.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/51858553156.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_9d40c35b2cd14e09afe26ca4759f7ba6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/kohler_command_pro_27_parts_diagram.pdfIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_87b283f06ce4426585580c149d516c26.pdf?index=trueIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_01ea4eaa051f48ceaf4f83c74d213731.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/vanchit_bahujan_aghadi_candidates_list_2019.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_d7cb9bdff48741a29b19feb549ab784b.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_eb5a768d50aa4cc9a556951de1cc8083.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_6fb30d35cb044049be7ca9e0b70c14ea.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 5084 bytes
SHA-256: f86ddcb7e2c1772030aac508c430d134797d4d5be217e46b4ca0a0fb7dbef352
font_01_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 10756 bytes
SHA-256: 1b563e5b159470bdec31be379c183925480b9b2785519b9d9e5624fc33116e82