Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd2cf7b1d7ca3ad…

MALICIOUS

PDF

81.3 KB Created: 2021-02-27 06:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: fe9cdacf4b42e1bc0b892d45a6729e75 SHA-1: dd4e6ffdbee35bfe6b09ab8bcad0a44c36f8687b SHA-256: 0dd2cf7b1d7ca3ade8b1371e5f77a53ab39bfd1af313858b28650349517fb574
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs, such as https://nipisod.ru/123?utm_term=bruce+lee+age+now+2020, are suspicious and likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=bruce+lee+age+now+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393189/normal_5fe9724911b80.pdfIn PDF document text
    • https://tunoworuv.weebly.com/uploads/1/3/4/0/134017870/8424d439270929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_5fdc0be6747cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484624/normal_602f3b7d67616.pdfIn PDF document text
    • http://aslixan.com/envy_4500_series_printer_driver5d6xu.pdfIn PDF document text
    • https://funotagikaxu.weebly.com/uploads/1/3/1/8/131857914/rokopazutav.pdfIn PDF document text
    • http://im-marceting.site/338939471268jew2.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/brother_dcp-_t300_manualb6f43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446925/normal_5fc8d45eee5eb.pdfIn PDF document text
    • http://reawolt.online/kalanefebevelulumaxbdk3n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_601fc954313b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448556/normal_5fdbbb6774637.pdfIn PDF document text
    • https://lefofikik.weebly.com/uploads/1/3/5/3/135316562/4124236.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/fodose/51884654647.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/thule_bike_rack_hitch_for_jeep_wrangler.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_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 5204 bytes
SHA-256: 2001067a4dd41ed96cbdcc2387b5e25cff040365bd2ceb2af2a53d5f47ba7bbb
font_01_sfnt_off000113dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 10636 bytes
SHA-256: c42a6c3c27075a2106d67175e841015c942df23603e8b19c57bd269ef8c04f1c

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