Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cdf7b7b5ff970f…

MALICIOUS

PDF

72.2 KB Created: 2021-02-21 11:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0c47480695e3c47123d05d60d996cee4 SHA-1: c34b0a31fe62cb0dd535dbaf5ed3ed7ad7b6286a SHA-256: 19cdf7b7b5ff970f520d35cd574cc69f794386d635f5a3a3501d5c1f8a0d3d7c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=how+many+new+covid+cases+in+san+diego PDF link annotation
    • http://amaryllis.space/iso_12233_resolution_chartxtea9.pdfIn PDF document text
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/zuvuvekixepebed-liribokamurirep.pdfIn PDF document text
    • https://sefomaxezaniv.weebly.com/uploads/1/3/1/4/131483109/d601fdc9406.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/501335.pdfIn PDF document text
    • http://alcexpress3.xyz/3908527749yz5iw.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/widY3q8/siwijeg.pdfIn PDF document text
    • http://profaudit32.ru/angka_penting_adalah7wztj.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/hgKhija/how_to_find_hidden_things_in_excel.pdfIn PDF document text
    • https://gakujoxabusu.weebly.com/uploads/1/3/5/3/135394689/jifub_vixojatisemes_jerogufedadutav.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/ijhar8n/64815261915.pdfIn PDF document text
    • http://all-system7.work/bamugai5ors.pdfIn PDF document text
    • https://sibomimotilelib.weebly.com/uploads/1/3/4/2/134235458/gojemuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375196/normal_5fc61a63ccef2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 5344 bytes
SHA-256: 09b7038eb8d8c743acb59bd766764aabf6599f738c809f2b4f9f9bfe9ff86f58
font_01_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 11572 bytes
SHA-256: 75b18281ffb32ecea649febb3e444b66e3150a8a34671ba4b510e7cf59b34666

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