Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9912bd25395274…

MALICIOUS

PDF

78.6 KB Created: 2021-03-23 04:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a172dfd87ad087c9f31fc700bd62c283 SHA-1: 16d6b727a8e2094a290f18c0f9a0a1184335ec68 SHA-256: 2f9912bd25395274fee0e4a932541b6944c7b23c30aa35fecbab7be4c0fe64d1
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=hp+deskjet+3051a+wifi+setup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380700/normal_601be6d889498.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/7192192.pdfIn PDF document text
    • https://ribebolavat.weebly.com/uploads/1/3/1/3/131398139/bakat-vexesazas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_6027c6b8ea766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481162/normal_6021baee6f184.pdfIn PDF document text
    • https://vajibenutiw.weebly.com/uploads/1/3/4/4/134487234/2129191.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/mapopevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424646/normal_604143717a7de.pdfIn PDF document text
    • https://gijojipile.weebly.com/uploads/1/3/1/3/131381352/rarojuwelitar.pdfIn PDF document text
    • https://cdn.sqhk.co/lepemafe/g8ciagc/ates_ve_su_3_oyunlar.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/SZVhcie/plants_vs_zombies_xmas_download_windows_10.pdfIn PDF document text
    • http://hookup755.fun/public_speaking_anxiety_articleswmoec.pdfIn PDF document text
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/982e5654e30d8de.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/jMXmhhQ/latest_action_hollywood_movies_2015.pdfIn PDF document text
    • http://prostosite.site/nostradamus_book5zbhb.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/Vgg8Xd4/74453050373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_604a123870937.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/43a64136-279e-47ca-bb13-684d2c42fe76/71410059837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/651684fa-8af8-4510-9dfc-ecdef819e641/diablo_3_season_22_chapter_1_rewards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/116118f9-2a26-4304-866e-8d77c3ac1019/how_do_you_fix_a_garbage_disposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839c71ae-9e0c-451f-bc63-db661f40a609/cortisone_injection_pimple_before_after.pdfIn PDF document text
    • http://bejanifezilo.atwebpages.com/archicad_19_keyboard_shortcuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f80e1d9e-8c4c-41c1-8721-6e09f02b4135/pathfinder_kingdom_building_sheet.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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 5248 bytes
SHA-256: cd627e33542d5b3b8a1a945fb817741fabf4bd6d93bb7e26e4ed0c9a971f8b5b
font_01_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 10968 bytes
SHA-256: 3cd8d8285c926bef2a811a1be544c2d2efdd9e96279021bd61478b6c91cab3fa
font_02_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34