Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04913571fbf2660…

MALICIOUS

PDF

73.5 KB Created: 2020-12-19 11:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5ab3424682d821f8541a7151ebf115ee SHA-1: 70ece09141eeef5840b11348ce30495f788f0781 SHA-256: d04913571fbf2660ebe2d247f3df3e73cda7748c1dc158bd47ce48a861bce9a8
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://cctraff.ru/aws?utm_term=maplestory+horntail+guide In PDF document text
    • https://nirulutot.weebly.com/uploads/1/3/4/7/134700174/1a0c3e1.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/7b980b86e3e6a3.pdfIn PDF document text
    • https://dumasibomis.weebly.com/uploads/1/3/4/6/134642495/lurizezaraxamef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470833/normal_5fa9e6dbbd179.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/potugesata.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/a24fee4d-1273-4aa2-b389-7e5ac3d8809c/noneli.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc174bcc89e1c4b8fc25c90/t/5fcded78662d5e24e0c5b9da/1607331193633/mastering_mixed_games_poker.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/60877641795.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunoje/the_return_of_the_king_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/39655144859.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/recurring_payment_authorization_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fae2df-ffe4-47af-9ec1-5ca4cec3c8a6/among_the_hidden_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb30a0d8-3b8f-43c2-8b7f-59749793e129/gre_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0dfcdf4-2df2-4f8a-a50e-58f96c48f873/tazivinewupokaxukulafupot.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_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 5328 bytes
SHA-256: 8e803348e505ebeefa0f902362530aa713b0e88e76d756b746e1544cb6ed8452
font_01_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 12104 bytes
SHA-256: e096857482e3d1e4219d765a59c6d547ee2630adfc449006e74380b2c28e883e

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