Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6a9ffd83548c6c…

MALICIOUS

PDF

88.2 KB Created: 2021-01-24 03:27:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e2ec9c8507128e600ff0419ddd6ecc7e SHA-1: 3ebf13242bcd682e907bb53fbf1486d0cf41cdff SHA-256: 9f6a9ffd83548c6c77ab1cc9982f7ba32534cb27966e2b10a3bb7e04ee3ebeb3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://traffking.ru/123?utm_term=wachtell+lipton+rosen+%2526+katz+careers PDF link annotation
    • https://detaxenenikub.weebly.com/uploads/1/3/0/7/130776267/jevij.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/wufew.pdfIn PDF document text
    • https://tabodixab.weebly.com/uploads/1/3/4/5/134585887/sunoxuneluteso_sowituribagabe.pdfIn PDF document text
    • http://finofoze.22web.org/zixamuvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408996/normal_5fe1c4a51ac36.pdfIn PDF document text
    • http://gikadoketu.iblogger.org/ladusulijaxikovewibuzijid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466662/normal_60028d210bce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_5fe967ecc94e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5fda80cb65b57.pdfIn PDF document text
    • http://refowozawigut.22web.org/79524188883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_5fe725a79bceb.pdfIn PDF document text
    • http://noveratufexi.22web.org/63935726908.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/3684379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472766/normal_5fe4a05c0f70c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lirufuti.epizy.com/demotion_letter_to_employer_template.pdfIn PDF document text
    • http://ferurexage.epizy.com/escardio_guidelines_pacemaker.pdfIn PDF document text
    • http://pekoguwomigurup.epizy.com/89050444583.pdfIn PDF document text
    • http://setuvufijub.epizy.com/78375637802.pdfIn PDF document text
    • http://dupikupujetilu.rf.gd/88754151703.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_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 5032 bytes
SHA-256: f12847797f3b669d7ed1183d461b182c3a4998fa9526aed9442a32273bb9c93d
font_01_sfnt_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 11232 bytes
SHA-256: cec6e79e653cfde9e1585d954e7f5df3497e99f71b97c00e99494973fc4f3c23

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