Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e5dc54ca072faf…

MALICIOUS

PDF

78.6 KB Created: 2021-04-27 23:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e923942bd263f683c7180241d6601323 SHA-1: e564d3f40d037d6c58ed4602ba8ce417a422ab3c SHA-256: a5e5dc54ca072faf002c988a9d72b049d7b0dbfba729d95aa7b8f3d1caa4ce86
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('resalured.ru') that is flagged as external. Heuristics indicate this PDF acts as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

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/strik?utm_term=canon+powershot+sx710+hs+superzoom+compact+camera PDF link annotation
    • http://kusulapezep.iblogger.org/free_ebook_reader_for_windows_10.pdfIn PDF document text
    • http://delojenopow.66ghz.com/fesagametow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_126fe59bdc54411e8d9af6fbfd3a9667.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/963789e2-9d4e-490e-8a97-7b9f4272ce8d/what_does_it_mean_if_a_contract_is_voidable.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/laminate_countertop_sheets_retro.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_0b82ed06c59945de9ee9f6d231b685f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosego/multiple_sclerosis_treatment_guidelines_australia.pdfIn PDF document text
    • http://pisizupulexus.rf.gd/mawlid_barzanji_english.pdfIn PDF document text
    • http://dosekidonara.epizy.com/domain_driven_design_eric_evans.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_5c5b871b91fb421ab1bc138eb0d74de0.pdf?index=trueIn PDF document text
    • http://rewexukid.epizy.com/world_famous_buildings_and_their_architects.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/inesss_infection_urinaire_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/balorazolelumol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89cf31bf-0fb8-41e6-93d5-f7e7e9974a06/bekabirilepot.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_de53c03393754bd6b5856d1a92c50a68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/496befd2-f156-4e30-9c70-b7b0e9a34500/canon_mp190_series_printer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/61242681725.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_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 5532 bytes
SHA-256: ee97fb6a455faf48af9ae990bfb117a54d6d46dc6e2d211d459e4ab950f9d98c
font_01_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 11340 bytes
SHA-256: 56cc1230b6f83b7b5d5091dc2342cd8cf24d78f7d56e01ffa8b2325076d3865b

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