Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5dec3d3827320a…

MALICIOUS

PDF

91.8 KB Created: 2021-05-27 23:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5118de531c15c5c6e0f02495ccd5438 SHA-1: 22bac8b80ba1a553ff4f89afe25dfbadaa33836c SHA-256: ae5dec3d3827320a9c2cedf797738cf100166ca67305a6f1dcb5e629b3ce1a40
136 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. A heuristic identified an external URI and an SEO redirector link, specifically `https://lozipotod.ru/strik?utm_term=levons+les+yeux+voici+la+vraie+lumi%25C3%25A8re+partition+pdf`, which is likely used for phishing or malware distribution. The document body, though heavily corrupted, contains text suggesting a lure related to a PDF partition, further supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://lozipotod.ru/strik?utm_term=levons+les+yeux+voici+la+vraie+lumi%25C3%25A8re+partition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5feb8fee4879e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499317/normal_60209a46294af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_60345bc0c1623.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5ff9d310890e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_605b9cea9017a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365627/normal_5fcd811835224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_5fd2a9c975da5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460446/normal_5ffec0076bcc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_604f36e9bd9b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_5fd3d6f4af7cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_6052aa7630708.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/ad9172ee-4bbf-4afe-8830-cc9bdd83ff92/nalukivixibanizokugewep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3afc3c0-c970-45ec-a83f-2c3cdeb7cb27/principles_of_design_emphasis_and_subordination.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cada5ad-65fd-4cce-9f92-d0257fc54c08/how_to_learn_basic_organic_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ec957e-ace3-48f0-8a0f-0ba98ceeb1f9/all_marvel_films_in_order_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caaf0c23-cd6a-47ee-9501-f647c7997f82/91080210362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0a6e47-e65c-4800-a467-f0fadd24b076/lowes_application_part_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a0c2792-66b2-4f13-a1c2-45bdc63250e2/10801607914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c1a618-6bb7-4f3b-b2aa-ac53f8e67179/toxolomitolalifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d047c3e4-00c1-4126-b85b-0d59ad77a91e/origin_of_species_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc8dbe9-e638-4357-aac9-f2fbe57d3644/vilaxomuxanatizufefon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dfe6db9-c73c-41b8-8e1a-31d3fc8ec04e/xusut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d5a1adc-d3e5-4484-b480-69b6d3d95764/dyson_cinetic_big_ball_review.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_off00012853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12853 5612 bytes
SHA-256: 1ce49cbe8a670ff2814eb21a9f8a7fa548ce72879d9842c760adb4db243a4200
font_01_sfnt_off00013b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B25 10580 bytes
SHA-256: a3fd43e6c4b1746ca6d126ba43c4829c9cc84d906eb1c83a63fe572066733b22