Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b6ae55ac18b7d4…

MALICIOUS

PDF

69.1 KB Created: 2021-04-05 00:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 79250475c76ca08075330282426bfeb5 SHA-1: 706288fc7b93bee90c0e034902675749964512d7 SHA-256: 20b6ae55ac18b7d4e9db893f7302ddfd93097b80d7044f34096a0c641c58c1ac
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit user trust through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=chemistry+book+class+10+icse+pdf PDF link annotation
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/6535037.pdfIn PDF document text
    • http://pexijub.iblogger.org/32577315121.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/zibikutereva_jodawebigalenol_lorabitufofekot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70141112-baad-43a6-94c8-b17b2f3ca6e4/90170975817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dfbfd3-b057-4c48-b244-6b7fadd16325/what_time_does_my_navy_assignment_open.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78313711-1025-40bb-9b56-fcddd0b6c748/gikenewolelonuporakedot.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/sapivawatubukalatuzod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2575ec-a56d-4d8d-81f3-20291f7d5eac/mobipefumupi.pdfIn PDF document text
    • http://zumojuluru.epizy.com/79718313918.pdfIn PDF document text
    • http://lowadof.epizy.com/what_is_day_trading_buying_power_td_ameritrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c1624d-57a6-47f8-8967-ba282f2fac97/the_mysterious_benedict_society_tv_series_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e56c7bd-64fa-420b-ab09-edf421ffcc8b/how_to_get_a_peq_15.pdfIn PDF document text
    • http://nifukugobu.rf.gd/fix_grammar_mistakes_worksheet.pdfIn PDF document text
    • http://tekonut.rf.gd/auditing_legislation_and_standards_2nd_edition_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/net_mvc_interview_questions_and_answers_for_experienced.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/78814015999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b46d4c7-63d0-4caa-84b9-03d4f5390efe/troy_bilt_27_ton_log_splitter_honda_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106db2ba-3b68-4969-9ff0-1d35815061f4/difize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f7c769-396e-4b65-ad9a-d66865d5baf0/95826303571.pdfIn PDF document text
    • http://sumimubilopane.rf.gd/reality_transurfing._steps_i-v_audiobook.pdfIn PDF document text
    • http://burabovedi.rf.gd/rupuzenobomegawepewanep.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 5800 bytes
SHA-256: 35e0103dc312870a2dbd86ee11cc131523d9f347799b2fa06507742ca88cd9d3
font_01_sfnt_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 10632 bytes
SHA-256: ddb8cf1080b2ba4563215289730c01d7a643284f05b131c06181d59ad21a6c80