Malicious PDF — malware analysis report

Static analysis result for SHA-256 f391b3aeb668781b…

MALICIOUS

PDF

64.3 KB Created: 2020-12-25 04:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7e5b0ae31365ce9e133fd6fd68971ed9 SHA-1: 874e50bed511209e01103a7fb08e487cecd5586b SHA-256: f391b3aeb668781b38f68af862ed4667e92b5b5a9280c78497840b498c937139
214 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for linking to known malicious redirector infrastructure and a high number of external PDF links, indicating a link farm. The ML classifier also strongly flagged this file as malicious. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=bangladesh+student+association+tamu In PDF document text
    • https://riwobasafogad.weebly.com/uploads/1/3/3/9/133999818/loladitonukolozonete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f88b68e3daa5.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/4Hxhegf/vonuxosunesot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_5fd3dd04ee40d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5f8b6b335317a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485166/normal_5fe40c60e1643.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/igjheRu/cartoon_video_maker_software_free_download_full_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f871e2ad104e.pdfIn PDF document text
    • https://cdn.sqhk.co/ludibipimilu/jcjeOlh/70623566528.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/gofilafixu/83419489478.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/children_s_books_files.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/sushi_cat_the_great_purrade.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD68 5308 bytes
SHA-256: a5e2d640328789d2d38a8f7d07ef0034454a88f38c0f4c6bcd1999da0bfff443
font_01_sfnt_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 11112 bytes
SHA-256: 82cfd32f51eede2c70a04e8e80a8827aa318e5965c0cadb967f1296591a3e386

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