Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf16d656abed4a10…

MALICIOUS

PDF

62.7 KB Created: 2020-12-16 14:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfc5a2cc4ad95e5f981c3297e0d409e7 SHA-1: 1518d052a6fd10f64b982fed67cd71180773dd40 SHA-256: bf16d656abed4a105e70a4ba91cffeb93bbf14250ee67c5882e106b778c07253
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate a malicious redirector and a link farm, suggesting the primary purpose is to direct users to potentially harmful sites. While no scripts were extracted, the presence of malicious links and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=siam+safari+chalong+phuket
    • https://ruxapumuful.weebly.com/uploads/1/3/4/6/134682584/texesug.pdf
    • https://fegunase.weebly.com/uploads/1/3/4/6/134603704/06ec2e0c802b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0cc6dc14dfd36fef0f123/t/5fc0da969ee0f32b87727c88/1606474391155/welebo.pdf
    • https://static1.squarespace.com/static/5fc0e90c27a199023ab56552/t/5fc107f5f81c9a2a0cc68a5b/1606486012218/31765320948.pdf
    • https://static1.squarespace.com/static/5fc12744239b07229132d4f5/t/5fc556869b1ed035388e9cfe/1606768262439/liu_kang_mortal_kombat_movie_actor.pdf
    • https://uploads.strikinglycdn.com/files/174b7b9e-b63b-4aea-b66e-ce6f80a4ad3c/kefasarugifix.pdf
    • https://uploads.strikinglycdn.com/files/f70a0dec-742d-4355-be26-df22f0818aae/libivipa.pdf
    • https://uploads.strikinglycdn.com/files/369a4327-6582-49e2-83af-bbb55d71c98f/kodejinubilujaz.pdf
    • https://static1.squarespace.com/static/5fc54fb0104edf1d779e56d7/t/5fd10058f3b3412bde6cc009/1607532633739/navneet_commerce_classes.pdf
    • https://uploads.strikinglycdn.com/files/9e3d1027-49a3-4e01-8ce9-e899e14cb7d9/59145069746.pdf
    • https://static1.squarespace.com/static/5fc28a899698b02c7f2b0c7e/t/5fc8d1308eecd53e39f3e213/1606996273391/pematukiparutup.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba5f.bin
439fe43f16e2cb8996a0f70c935e4c900342f11de649739b320b6dea4ff3f58c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5F 5596 bytes
font_01_sfnt_off0000cd41.bin
a1d38cadc22d7cf4baa0ee140e8e826c8d3508c24702fb4977a810ca9f601e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 9780 bytes

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