Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae46f9916dd6aa1…

MALICIOUS

PDF

77.9 KB Created: 2021-02-13 03:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2da4651b56eeaad40c67769dd65816a4 SHA-1: e93c49044b63ac0224e948e9e70ccca67be069c2 SHA-256: aae46f9916dd6aa138c01e00788ec467fe532d109bf24ba90ea88720672bee4d
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

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://jottigo.ru/wix?keyword=flip+case+samsung+galaxy+s5 PDF link annotation
    • http://bestunew.xyz/3494456211234e54.pdfIn PDF document text
    • http://drenajkrasnodar.ru/nejetubaziginamogilorg6msw.pdfIn PDF document text
    • http://puxeguka.iblogger.org/26618492581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486197/normal_5ffba955b5ede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472495/normal_5fdab8d8832d3.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/nujefus.pdfIn PDF document text
    • https://sukivafuxek.weebly.com/uploads/1/3/0/8/130874221/supebefebifa.pdfIn PDF document text
    • http://nupigit.22web.org/angus_cattle_breed_information.pdfIn PDF document text
    • https://gosevitugelaw.weebly.com/uploads/1/3/4/4/134439416/5684392.pdfIn PDF document text
    • https://wininivawad.weebly.com/uploads/1/3/1/4/131483201/8433593.pdfIn PDF document text
    • http://tihefers.online/type_casting_in_java_with_exampleky666.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/650260b4790.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jofawapedoguw.rf.gd/15397153676.pdfIn PDF document text
    • http://fepapemifen.epizy.com/comprehension_worksheet_ks2.pdfIn PDF document text
    • http://regisebe.epizy.com/company_event_invitation_template.pdfIn PDF document text
    • http://wutugegazebezop.rf.gd/44868472546.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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 2876 bytes
SHA-256: 60aa23f49a302afdaf9f45e6c9f0fe011b8535f0c57595f594cdcaf509c0389b
font_01_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 5408 bytes
SHA-256: 91c4eedd96e3ffd084cc8b3a9412a74a77e148501ab2ce781b0dd68ed4bc6b1e
font_02_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 14696 bytes
SHA-256: 2490e9084b55cbe70e75573acc4b09ddadfb257edc60eb4879e1d1a09ce3cd9d

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