Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d7058ab864db55…

MALICIOUS

PDF

73.3 KB Created: 2021-01-18 02:20:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6d5f2f0a88e99241db19a8892e2b65ac SHA-1: 91e6aa75e00852b0aac704317371af36b03314d8 SHA-256: 42d7058ab864db55c7082c2345252fbfaed190acdb1c3c1ed1faa5c2bed82fe9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Numerous embedded URLs, including one pointing to 'traffnew.ru', suggest a phishing or malware distribution attempt. The PDF structure also indicates it functions as a link farm, directing users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=chernobyl+disaster+bbc+drama+documentary PDF link annotation
    • https://site-1183491.mozfiles.com/files/1183491/piruvefetorenoxazave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_5faefde8ed312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392453/normal_5ff455962b24f.pdfIn PDF document text
    • https://site-1178774.mozfiles.com/files/1178774/anuria_oliguria.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/1f3af8a9a5.pdfIn PDF document text
    • https://site-1171150.mozfiles.com/files/1171150/off_road_rally_game_download.pdfIn PDF document text
    • https://site-1241671.mozfiles.com/files/1241671/87643372778.pdfIn PDF document text
    • https://site-1180490.mozfiles.com/files/1180490/sudepob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_5faff6f04d560.pdfIn PDF document text
    • http://lalozakuren.66ghz.com/gogexafejegolifepopi.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/5832700243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_5f98a03cece8b.pdfIn PDF document text
    • https://luwovizebezew.weebly.com/uploads/1/3/4/4/134482442/192053da68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5fcaea7423352.pdfIn PDF document text
    • https://site-1173293.mozfiles.com/files/1173293/vogatemisivugog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenivut.epizy.com/gaxigukozij.pdfIn PDF document text
    • http://zusobudem.epizy.com/progress_report_comments_for_average_students.pdfIn PDF document text
    • http://jivugojazop.epizy.com/tajemuwuloxuweluzilogug.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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 5324 bytes
SHA-256: 6a0e12427edb28350e1cb3b932be7c05d65a3e9b70d959542f87722b3695a7d3
font_01_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 10360 bytes
SHA-256: b607e8865c016143236ae74341bd789fb918232bf74648c46e60086828436714

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