Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e134a1f2b9ec57b…

MALICIOUS

PDF

79.8 KB Created: 2021-01-22 12:36:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 41027d034bf6d3ad8df8fac0a984d15b SHA-1: b8798f6d6020c309818a83fe4247ff5bde2ca6c4 SHA-256: 4e134a1f2b9ec57b723c1369303473d66e6ef1ffe1be3b5b4384ca57facc1785
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of malicious links is sufficient evidence of an attack pattern.

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
  • 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 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.
  • 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=word+choice+examples+in+poetry In PDF document text
    • https://site-1176681.mozfiles.com/files/1176681/vitamin_c_foods_for_vegetarians.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5fcbb0c58ee78.pdfIn PDF document text
    • https://site-1173352.mozfiles.com/files/1173352/best_live_news_channels_on_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_6009e1898d129.pdfIn PDF document text
    • https://xalovediluf.weebly.com/uploads/1/3/1/3/131380345/1552143.pdfIn PDF document text
    • https://babixugopanodip.weebly.com/uploads/1/3/5/3/135382952/6680150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412763/normal_5fe2ffae00791.pdfIn PDF document text
    • https://site-1177330.mozfiles.com/files/1177330/3484532945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473384/normal_5fdb7956baacb.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/zufobepupi.pdfIn PDF document text
    • https://site-1179748.mozfiles.com/files/1179748/3598721997.pdfIn PDF document text
    • http://wofixizufiw.22web.org/android_actionbardrawertoggle_change_icon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xepadegi.epizy.com/scratch_4_arduino.pdfIn PDF document text
    • http://direpedokelazal.rf.gd/mukonerexuvowelakejex.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/munadewexivumugomur.pdfIn PDF document text
    • http://jeloneliva.epizy.com/83709794956.pdfIn PDF document text
    • http://sexililelaweru.rf.gd/feasibility_study_templates_free.pdfIn PDF document text
    • http://www.readwritethink.org/classroom-resources/lesson-plans/choose-select-settle-exploring-1175.hIn 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_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 5496 bytes
SHA-256: f07ab1aadb3f39105732e413ed6037ff74b05429632e0fc60698890f290e9d69
font_01_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 10764 bytes
SHA-256: 78a143b36595f004e7cc1504ee3999f57333ffcb6387442433059f15a098f72a

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