Malicious PDF — malware analysis report

Static analysis result for SHA-256 8736abdb83213c7d…

MALICIOUS

PDF

69.3 KB Created: 2021-03-03 08:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e635d55eda803d21c2532649f921cb75 SHA-1: 32d68b7fe3ad4d76e96a551adf165861fe9982a3 SHA-256: 8736abdb83213c7d45ddd9596921bbc10cd2962c410c42d2d56be37993b1bee5
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 designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to potentially harmful 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://maypoin.ru/strik?utm_term=christmas+carols+youtube+video PDF link annotation
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/buwanaravoju.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/4511781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_602c8bd933ec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_601b99660f126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_601afe4392971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448129/normal_5fe61ee61af9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484623/normal_603981936c77b.pdfIn PDF document text
    • https://nisuwifa.weebly.com/uploads/1/3/1/4/131453943/57252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_601380de5591b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_600bb7da5689a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_6019b001afdef.pdfIn PDF document text
    • https://xivogere.weebly.com/uploads/1/3/0/9/130969247/f8dd4723339fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_601b491363e03.pdfIn PDF document text
    • http://luminar3-download.xyz/45863008889ot97h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vokesakogo.onlinewebshop.net/how_do_you_reset_the_liftgate_on_a_toyota_highlander.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/13427082362.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_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 5388 bytes
SHA-256: a910813faed59927fbb3dc331408f080cd6c3be42802d46a712714e49c3fcdf3
font_01_sfnt_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 10156 bytes
SHA-256: 6bae04967444fbb408ee60147718daa06f9f911b4d73c22ebdd15853a9cc99cd

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