Malicious PDF — malware analysis report

Static analysis result for SHA-256 975e07083284e4d5…

MALICIOUS

PDF

69.5 KB Created: 2021-01-01 22:25:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e3eb3305690561acad1aafbd6ecbba2e SHA-1: bf7ada657427c8c68729177870cfd477423272c2 SHA-256: 975e07083284e4d58d68e415329d7923a2406a1c49a7263d95cebf0635474f71
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links pointing to other PDFs hosted on disposable domains, suggesting a link farm or a distribution mechanism for further malicious content. The presence of external URIs and the overall structure strongly indicate a phishing or SEO spam campaign.

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
  • 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.
  • 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://traffset.ru/123?utm_term=victorian+era+children%2527s+names PDF link annotation
    • https://soregoba.weebly.com/uploads/1/3/0/7/130739918/tuvugirofidotipu.pdfIn PDF document text
    • https://kukezuleji.weebly.com/uploads/1/3/4/3/134361302/312ff21a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493282/normal_5fd873a36b53c.pdfIn PDF document text
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/dudojezodije.pdfIn PDF document text
    • https://pukuxenusafo.weebly.com/uploads/1/3/4/7/134711282/lalopoloraloga_rekaj_najifanofivade.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/5db2cc1da422e.pdfIn PDF document text
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/fukesaj.pdfIn PDF document text
    • https://fawubanine.weebly.com/uploads/1/3/4/3/134321827/dupukumowij-vogekuzejir.pdfIn PDF document text
    • https://razesupimo.weebly.com/uploads/1/3/2/8/132815812/regan_puseku_lezuxunaforelud_samotitak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5fcbfe108e32f.pdfIn PDF document text
    • https://teriwogawuf.weebly.com/uploads/1/3/2/8/132815342/jifugikejobap-lopigulupejuf-ponetonitew-supogofisovef.pdfIn PDF document text
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/7807908.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juvetaso/mirekebeveworivukiw.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/gofegofurubu.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/bayliner_capri_2150_swim_platform.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_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 5176 bytes
SHA-256: 8d051abfacd93a0472347fede89d98cfd246f13a533f7e65c63a499b93cdbf91
font_01_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 10136 bytes
SHA-256: 71b771be1fd2f3bf05e52f8274db37431b145322e28f1b631a0a1c70e193e3d9

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