Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3a011ad0692222…

MALICIOUS

PDF

72.0 KB Created: 2020-12-30 09:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8feb6d500a096adecaabd2bff04dbb96 SHA-1: 13beb9dc22892801fdbcac7eca9f44c59060387a SHA-256: 8d3a011ad06922222b42344547659d43c0a8b87e41e3940df604a6a0a5a3e5f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://traffnew.ru/strik?utm_term=draw+it+game+online+play
    • https://cdn.sqhk.co/nosuterib/hgepm8S/zanukizunizivadobalinovut.pdf
    • https://cdn.sqhk.co/gigemuji/ijiXU8h/amazon_driver_uniform_requirements.pdf
    • https://furewerojerekez.weebly.com/uploads/1/3/4/3/134370242/fakitita-buwej-busupebemu.pdf
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f87fe9e41d6b.pdf
    • https://cdn.sqhk.co/sejixikerut/iejcgdD/tik_tok_joker_ringtone_suicide_squad.pdf
    • https://cdn-cms.f-static.net/uploads/4413843/normal_5f9ac94794cd0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c1cfa1e4-b47f-47e1-8bf7-1761150449db/valukubogifejivojakudewo.pdf
    • https://s3.amazonaws.com/jejulurowev/open_and_closed_circulatory_system.pdf
    • https://uploads.strikinglycdn.com/files/b2307a64-7254-48df-8fe2-3a31200ac94d/98876588793.pdf
    • https://uploads.strikinglycdn.com/files/5f2a03f7-c77e-4f36-a757-1adcadaaca6f/website_in_spanish_translate.pdf
    • https://uploads.strikinglycdn.com/files/3bd8c1ac-93e7-485b-8ccf-4130280416fc/daughter_from_danang_summary.pdf
    • https://uploads.strikinglycdn.com/files/eab45069-1b3d-419f-820d-af883886c9c0/solve_2x2_rubik_s_cube.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_off0000de15.bin
509578e0dc94481415f4b901df3eee2288161fa5c342ff59cd29f788b6305b96
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 5156 bytes
font_01_sfnt_off0000efa9.bin
95e5aa4a74c50aff347c44d2cb791915c672148e815ed5d08ddccd66de8f3009
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 10476 bytes