Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a898add726f1df0…

MALICIOUS

PDF

79.1 KB Created: 2021-02-25 23:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d49d14e4fe8da6156ca4a853c8d60c15 SHA-1: 43f0d7c48ce4629ef1d0b2d1e9acb1250181e6ef SHA-256: 8a898add726f1df0fcd579007dbb34778e417f32aafd3adabb12c1ac7f9ea7b2
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to distribute malware or phish users. The presence of a 'download button' heuristic further supports a malicious download lure. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=terrarium+tv+latest+apk+9.9.9 PDF link annotation
    • http://amsidisi.xyz/depejunigupinozl6dtz.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/54104589988.pdfIn PDF document text
    • https://gulufoge.weebly.com/uploads/1/3/0/7/130776817/a0dec4024d8c5d.pdfIn PDF document text
    • https://bojijoda.weebly.com/uploads/1/3/5/3/135325587/juwomanoxuwa.pdfIn PDF document text
    • https://wunobenera.weebly.com/uploads/1/3/4/8/134887230/22e4a8673.pdfIn PDF document text
    • https://sevozinevuzejok.weebly.com/uploads/1/3/4/9/134903388/waxowasafelukarupe.pdfIn PDF document text
    • http://lianhua.life/perumubp67rt.pdfIn PDF document text
    • http://japadalifu.22web.org/materiales_dentales_barcelo_gratis.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/3865081.pdfIn PDF document text
    • http://apparently-home.com/totusus069l.pdfIn PDF document text
    • http://maturibcgj.space/super_mario_odyssey_bonus_travelers_guide6ikmu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoripevi.rf.gd/1983254531.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/31468008890.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/88546186061.pdfIn PDF document text
    • http://dixasimoxipux.rf.gd/nuxigepimijosi.pdfIn PDF document text
    • http://nipovowegase.rf.gd/jujebidujifiluj.pdfIn PDF document text
    • http://gamemogap.epizy.com/nokunurukoxi.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_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 5228 bytes
SHA-256: 8cde0fdea4cf1e61304d5d2eafc6f4f57ebfcd08f49977da479eaac8e505c634
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 10692 bytes
SHA-256: 91620c88733e57bf7076b1dfa7f7c2b54bb5a5ee21f2eed32cc8a11a758c4f3f

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