Malicious PDF — malware analysis report

Static analysis result for SHA-256 d643a5d00900c558…

MALICIOUS

PDF

79.8 KB Created: 2021-03-23 00:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fa42cf4d03e9ddc63c3cacf548da38f9 SHA-1: e9d8a3a9fb7a91f3adea4c95d7535d987bf22ec5 SHA-256: d643a5d00900c558fa7920b656d84c208d4e72e9cbc7b3118b24556bae151eac
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and exhibiting characteristics of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://vilenefex.ru/strik?utm_term=can+you+walk+up+mount+olympus PDF link annotation
    • http://wisitens.online/forty_rules_of_love_in_urdu_priceq5spz.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/hgmphdW/13778950335.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/TgdZvhh/dragon_warrior_2_nes_download.pdfIn PDF document text
    • http://wonder-ita.fun/wuzazanunazasejadjanit.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/eMhgjgt/indoor_skydiving_houston_tx_price.pdfIn PDF document text
    • http://baltika-trans.ru/debuvovurovaxunaenfmp.pdfIn PDF document text
    • https://cdn.sqhk.co/vutowogipu/gBOiahg/60757491968.pdfIn PDF document text
    • http://gatorama.site/ue_megaboom_2_for_sales5rai.pdfIn PDF document text
    • http://50offit.pro/togajikezulizemscere.pdfIn PDF document text
    • http://erogan-oficial.site/bamaresapufuz84mv.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/cia9Uwz/download_game_driving_school_2018_mod_apk_rexdl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8a7e5d05-b280-4172-92d0-68b5efd58418/are_markets_open_on_thanksgiving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf2d362-cfec-49f2-98ea-6c413632716d/68652982609.pdfIn PDF document text
    • https://a1bd7baf-2de3-4c81-8914-4b74a732ecf9.filesusr.com/ugd/c89f15_2d922bfa551a47af93445f2d3fddeacc.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_3425bca2fc2643cbb71f2648aab94b51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83db7b9c-6cdd-4aad-9d3a-382da3d2ea7a/12106396249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17eb8044-17cf-45c9-b347-c9591c009dcd/what_does_gold_mean_in_speedrunning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6245465-af71-425c-ab08-a03f6702eb2c/audacity_app_for_android_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2825b9-f545-487b-ad4a-c8836fa14b12/high_fodmap_food_list_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30eed61-3ef0-4a58-8e17-d4e66476e1ed/sedopuraxase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/218f5abd-7e65-4c36-b99f-fdc6f9f40bb2/69803828613.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 4864 bytes
SHA-256: 8c3907530f9a3e782b55900ddbcbcadc36f5cc4c39f37164438c58f34d95b178
font_01_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 10364 bytes
SHA-256: ebef52ca3cbab10b570db73e2bb0fd2da6aebceceea3eeadc05899c7eb0b55f3
font_02_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c