Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a82f168cc1cf0e…

MALICIOUS

PDF

81.1 KB Created: 2021-03-20 14:10:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7a3060b9e9944f81de6d1eb5c907fd4c SHA-1: 0e4409d795d16ef0d30896220e9447e4392db5e2 SHA-256: f8a82f168cc1cf0e5db17c9ff88d2111076b398944505bdaed4cd886b3061c75
126 Risk Score

Malware Insights

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

The PDF document is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or spamming campaign. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://leonvi.ru/award?keyword=ielts+writing+task+1+sample+answer+band+8+pdf PDF link annotation
    • http://creditscorerepair.info/88615287960gh47s.pdfIn PDF document text
    • http://websecurer.tech/46265545995kmj8n.pdfIn PDF document text
    • http://nazhivy.net/30519221754rmvs4.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/nutritional_ergogenic_aids.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_6015d5934e278.pdfIn PDF document text
    • http://ebay-coupon.ru/wubalulopoxidn0ooa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427094/normal_6000260ca6a87.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/admiral_washer_error_codes.pdfIn PDF document text
    • http://duplicwcnj.space/percy_jackson_sea_of_monsters_watch_movien96cb.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/bhagavad_gita_english_iskcon.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
    • http://fetekovabu.onlinewebshop.net/how_to_change_time_on_a_timex_clock_radio.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/hp_elitedesk_800_g1_twr_graphics_card.pdfIn PDF document text
    • http://witimalolikoji.rf.gd/6403609971.pdfIn PDF document text
    • http://xazasanedaned.epizy.com/cavalier_poets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3dc78e4-0c83-4aad-9564-f3c3367e8d43/kodejajajizufen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35179d42-a10b-44ee-b555-12e6a9b0034d/8567027606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f2f557f-cfa3-48f2-8e63-792984a4bafb/prescription_safety_glasses_frames_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34b17af-1452-4b42-9c48-a045c20388ad/which_treaty_ended_the_war_of_1812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb901f8-62b0-48b4-a0ac-dfb56b491fd2/50408290273.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_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 5516 bytes
SHA-256: 2c0230fa6a2f071c471c1e8ca09c3d012645923a75286c3e93be98e7ac02558f
font_01_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 11324 bytes
SHA-256: 9722b6628b41de814d714fdba95d7eabf41de78f6a37ff1ecc9a9250e542ea62
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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