Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52964c09a8621a1…

MALICIOUS

PDF

76.5 KB Created: 2021-03-30 15:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0d8b6e479f3257aba61f80fb435cadde SHA-1: 7b89e7c74a7aa174ef523aa0f4c539aa0bcc63c2 SHA-256: a52964c09a8621a1bc3bd1a4e3a5e1d026544c936a62a28b2d166c1bbd995c39
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically pointing to a suspicious domain 'vilenefex.ru' and another to 'springtea.space' which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vilenefex.ru/wix?keyword=manual+citizen+eco-drive+perpetual+calendar+portugu%25C3%25AAs PDF link annotation
    • http://springtea.space/malesunumvg43.pdfIn PDF document text
    • http://podarokinsta365.site/lejulidevejamududakunzcp8.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/8181740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_600fdbdcb0c51.pdfIn PDF document text
    • https://metatigizedi.weebly.com/uploads/1/3/1/3/131398099/2483534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427509/normal_5fe709ec974a6.pdfIn PDF document text
    • http://zuxenegobepejij.22web.org/abundant_health_in_a_toxic_world.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382186/normal_5fdeea0fcd440.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/bf49265b2348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_602006171d0fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_6054e3aa6399b.pdfIn PDF document text
    • http://paxebijevoz.iblogger.org/how_to_print_digital_paintings.pdfIn PDF document text
    • https://pejejuwefosewa.weebly.com/uploads/1/3/4/0/134040570/zagoresujitiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sarovagovoz.rf.gd/97157000939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/635c7edb-338c-4f17-8644-b28500d17fdd/how_to_allow_flash_on_chrome_2020.pdfIn PDF document text
    • http://rivebop.epizy.com/24341605929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54577e7-1043-4970-a29e-64a8396c1d50/rusemokiwunazaravuvisoba.pdfIn PDF document text
    • http://melaworogafema.epizy.com/ice_sheet_vs_glacier.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_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 5540 bytes
SHA-256: 0e6dfc4354097325a5508a4086e15f9133bc880e930745ce1ccc9c0b501a553b
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 12948 bytes
SHA-256: ce97e74ba630e7bb7171606e886bffcb8036be32160e00ef4a1cdd1c536f88ca

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