Malicious PDF — malware analysis report

Static analysis result for SHA-256 287cd4451e74d61d…

MALICIOUS

PDF

58.7 KB Created: 2020-12-06 05:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9c3665ac5eabbc61ef12085a6468aea8 SHA-1: 3a8ac50e0e37c2663b9d61c880af1ecd3d23440e SHA-256: 287cd4451e74d61d686c8a8bbe7bc2a8f45adb406befc8bde12e38d65ef33b3f
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm, with one prominent URL pointing to a suspicious domain that appears to be related to a product search. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://trafftec.ru/strik?utm_term=north+face+women%2527s+jester+luxe+backpack PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5fcc2e6decc28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_5fbf300acb673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_5f95a18ae6eb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fab16f6a98cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_5fa7c7ede16fd.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/7376adbed2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e60b24b06a7eb3ff207b/t/5fc10e26e18c5c478e211b24/1606487599846/bomebafaba.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc07d836b97992eb55a0df7/t/5fc0d7ffeaf37e3b64bb6dcc/1606473727764/23439949920.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6562327a199023ada57b2/t/5fcc53095177ea328cb78cbc/1607226121666/dune_book_series_hardcover.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/ipso_facto_clause_reform.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/sole_e35_manual.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_off0000ab86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB86 5696 bytes
SHA-256: 4726df3a07b1c6463a2761fd0456fa1eb1cb82b56d7a949f009190e81657efe5
font_01_sfnt_off0000bee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE1 9120 bytes
SHA-256: 8dbce13bed68018e843f9cc4ab248ff610e1f33c6a1b096b875fbaf5aae639be

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