Malicious PDF — malware analysis report

Static analysis result for SHA-256 de128596443aca5c…

MALICIOUS

PDF

86.0 KB Created: 2021-03-31 09:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3a24d5ae7ba3cb9914d16abf01dde27c SHA-1: 6fa1d709d0f77ffaa5b71e5144bdbcdeb990cb4d SHA-256: de128596443aca5c5eab9fbd3c1488c704c19d4e5efa3f200219715cc6914e9a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link analysis suggest it's designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=asc+842+leases+pdf In PDF document text
    • https://cdn.sqhk.co/gavonenegave/henuCdN/basalt_rock_formed.pdfIn PDF document text
    • http://mbfsopg.com/83998153515jz1fy.pdfIn PDF document text
    • http://christmas-gift.ru/dolopotekevekadarubavu14pqo.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/chapter_8_chemistry_assessment_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/1Sibhgl/reconfigured_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/VjjIhhC/super_drop_land_online.pdfIn PDF document text
    • http://leafester.online/mr._coffee_mug_warmerqpzyd.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/gchePjh/zibuborixotojedadalarus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462037/normal_5fed193a5c018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474446/normal_6041b44ac8698.pdfIn PDF document text
    • http://ririzobe.medianewsonline.com/bebudurinajezefesaxopom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_5fd0e41eec7e7.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/childhoods_end.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403121/normal_5fc825a935955.pdfIn PDF document text
    • http://remontlegko.info/how_much_does_it_cost_to_fix_service_engine_soon_lightqyrdp.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/45489006487.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/varulowosafuve.pdfIn PDF document text
    • http://all-casino.xyz/airbus_a330_seat_guide7fwoh.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/brother_hl-2270dw_printer_toner_reset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_60551e629dbdb.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/31e51a96-aeb5-437e-8b81-da5a4584fb71/bivopiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aaf9c0d-bc14-4dcd-a677-223c293dcec6/sarejoxasodujemefivop.pdfIn PDF document text
    • http://moxadokikubod.onlinewebshop.net/listening_answer_sheet_ielts.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_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 5456 bytes
SHA-256: 36b3fec12fb552243f79315dbd5f1e45419264764cabe7b03c3ed6be2ba70f47
font_01_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 11660 bytes
SHA-256: ee1da9caaa3d6a2564933280ddf0a30a547e21cf9bd1c5cb4314891c96ce6c04