Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d65b7102e966dd3…

MALICIOUS

PDF

79.3 KB Created: 2021-03-16 18:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d6243d2a6aeec4ed100dc9ae44ad66c8 SHA-1: 5046a1182822389434805c8c5b8ec671ead1a883 SHA-256: 3d65b7102e966dd3f3e75ae356f34c9e5ce3e83ae1aa232c8d763e7297ae5088
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant number pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to architectural search terms, directing users to potentially harmful sites like resalured.ru and liketsven.xyz.

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://resalured.ru/award?keyword=que+es+soleamiento+en+arquitectura+pdf PDF link annotation
    • http://liketsven.xyz/353139518601ik9s.pdfIn PDF document text
    • http://tafelutij.22web.org/63630060258.pdfIn PDF document text
    • http://menozamula.22web.org/91341127399.pdfIn PDF document text
    • http://espacecmb.xyz/balancing_equations_worksheet_1______na3po41aqv5.pdfIn PDF document text
    • http://nesobaka7.xyz/e2_hitch_installation_instructionsbs30k.pdfIn PDF document text
    • http://storezone.info/jibiwinozomavitaruxenoo83xg.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://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_0daaf2e2e164454e99ffbd95589b5a1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b128cb15-e52a-4a04-a7c0-0aa19f4b32cd/18232679164.pdfIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_7b5fe4d712f6451db41934f99a598f27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23702bd1-f189-4cab-8ade-ea5ba27ba9d2/maze_runner_death_cure_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/agile_transformation_inc.pdfIn PDF document text
    • http://kavisawadafo.epizy.com/tv_guide_itv2_1.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/2961572870.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/13329783022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dba24b4-25bc-4149-af16-a1dcf1f5eb7b/mastering_essential_math_skills_problem_solving.pdfIn PDF document text
    • http://kunasajijujaf.rf.gd/makalah_asia_tenggara.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_off0000e648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 5368 bytes
SHA-256: d5c92c911b1d223e62bb0142f63c07191b33e1d8530fd88e66ed349f6be90e08
font_01_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 12608 bytes
SHA-256: c3eca5872449dad71427b2267e8058bb753e6fbf55cc2aa40c3f3e385b054cf6
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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