Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c52834d9b409c4…

MALICIOUS

PDF

81.0 KB Created: 2020-11-24 17:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e04a44a3fece6ac222633721aaa0b3a9 SHA-1: d5a7b3bf8be74a6318b879aa6a99c3e34e5872fa SHA-256: 39c52834d9b409c4d2bca20b192d3ddd8daaf9879214be14264c3fb7795ce361
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for redirector links and a PDF SEO link farm. It contains numerous embedded URLs, with at least two pointing to suspicious domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain keywords related to 'social security office california', suggesting a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffking.ru/123?utm_term=social+security+office+california In PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/difoduwebuvim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_5fb4bbef1a333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412773/normal_5f9f09745a14f.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/nupuvu.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://uploads.strikinglycdn.com/files/cf295224-7abd-4058-9014-5d65aa369d27/sibotitotajuporonisokum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b425e291-0c30-46e8-ac21-3066ed1aa0c8/xiwisoxame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f8be37-afb1-4625-86ba-434ca51b1113/pirapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9adff739-60e6-4220-8e10-b44645b0df5e/xakunipunazeroduru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f19491-b965-4446-b4d2-2486a1df7bf4/lebidezivebuxelum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7041a6db-ca57-41c3-9de7-2703b32c90cf/9_panel_comic_strip_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148236c7-f5ed-4911-a808-0c001d87a386/31508078434.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_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 4964 bytes
SHA-256: f508206c3f0b3606b1c6980e5dc2469e3870b13d5fedb4726a2bc35df9f7efda
font_01_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 10792 bytes
SHA-256: ad2949dfc92615a6846e78a495ca59eb9615678425ff341220b7fa1041c8b7e2
font_02_sfnt_off000128ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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