Malicious PDF — malware analysis report

Static analysis result for SHA-256 423b1da8b0b2da38…

MALICIOUS

PDF

43.2 KB Created: 2020-10-06 20:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 98aa05ef309412a969c4e4adcde99061 SHA-1: f125c523af0f19a36024453612b3ca11135ba429 SHA-256: 423b1da8b0b2da386d2664ce046c653937e459ce650ecf100321db9d62a3fd43
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. The ML classifier strongly indicated maliciousness, and the embedded links are designed to lead users to potentially harmful sites. The document body text, though garbled, contains a URL that is also present in the list of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://gettraff.ru/strik?keyword=manual+de+entrenamiento+de+futbol+pd In PDF document text
    • http://gasikof.monumentalbeginningsdoula.com/uploads/1/3/2/6/132695601/d8a54.pdfIn PDF document text
    • http://dedanubu.nuskillz.com/uploads/1/3/2/3/132303099/5189170.pdfIn PDF document text
    • http://guloxox.ellenitesfayephotography.com/uploads/1/3/0/8/130813528/475ff419.pdfIn PDF document text
    • http://tatoluvun.jasonjenningsvideo.com/uploads/1/3/0/7/130776702/kebegobomag_fimoxoxawadi_parusakowe_wigatuvo.pdfIn PDF document text
    • https://site-1036939.mozfiles.com/files/1036939/23104325525.pdfIn PDF document text
    • https://site-1036815.mozfiles.com/files/1036815/24506839045.pdfIn PDF document text
    • http://wegozu.danishamericanheritagesociety.org/uploads/1/3/2/6/132681030/jozobami.pdfIn PDF document text
    • http://jamov.raeleensfancyfaces.com.au/uploads/1/3/0/8/130874429/rofej-roxebesikapefu-gewizewapes-xizigivep.pdfIn PDF document text
    • http://vojeviwi.asiabizgroup.com/uploads/1/3/1/0/131070420/wideken-narudebet-wasefiwotetakan.pdfIn PDF document text
    • http://files.amarillo-massage.com/uploads/1/3/0/7/130776408/pulatipam-dubax.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/ebd7736d-6cda-4c98-9d25-17a2a1f12ef1/nodinajusutuvosemibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aab037e-7b70-45c5-96fb-4d20f28a43ce/62208355888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/933ff511-0a39-4070-888d-9090371009d6/zatosilekipij.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_off00005c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C59 5036 bytes
SHA-256: 27dc912e7217e8fbfe10322da439b4610fa4c1c660ba5c56e0303ace1cf4e28e
font_01_sfnt_off00006d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D53 10760 bytes
SHA-256: 49539ad40c586a08d1020d6debfda9adf317b1c36a1fb50a191de4c70f09d43f
font_02_sfnt_off00009044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9044 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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