Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b77f6a325268c3…

MALICIOUS

PDF

65.8 KB Created: 2021-03-03 01:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3c9adccea3ae8001bf815f8b4ff0a337 SHA-1: 525b40b96fd25476ff8489b95301c4b65dd18cf7 SHA-256: c6b77f6a325268c3e4e0a7257e4e18d3da44d083e7478b4aaed1729c5c3da0ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various domains, likely serving as lures for users to download further malicious content or provide sensitive information.

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
  • 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://golowaki.ru/strik?utm_term=false+god+4+letters+crossword PDF link annotation
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/9068aaf9944a.pdfIn PDF document text
    • http://javebamugizal.66ghz.com/public_law_in_south_africa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_600bcb46522e8.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/cgfPjeG/telegram_download_for_android_4._2._2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5ffa7caf5f67e.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/fjcYohj/gun_master_g9_song_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5fe552c580dff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412905/normal_5fed9d1916f10.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/jawgj4B/legend_of_ace_best_heroes.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/supply_chain_management_internships_spring_2021.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371014/normal_5ff950043f7d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_5fe6b47fed60c.pdfIn PDF document text
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/7805083.pdfIn PDF document text
    • https://rupubonu.weebly.com/uploads/1/3/0/7/130739332/8917715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_5fc887490d3c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489976/normal_5fe23912dfc92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC573 5240 bytes
SHA-256: ff3f987ba0baa5e6d76359be486428e8f297e591db6ab0f5d7c2cd3b4e3d4f9c
font_01_sfnt_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 10112 bytes
SHA-256: 2fa051594f69f60fdc1388598c4215de9670559c1d9099dedf93f7b33e710067

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