Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d822c35e90625d…

MALICIOUS

PDF

78.1 KB Created: 2021-03-04 07:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0291a6f724ceb0f6bb9127c94fa09665 SHA-1: 1e1af7d9a2b6b46902544ab4aa9113da82d44a71 SHA-256: b4d822c35e90625d5353cf77c3df88d360a4b3df65e1f9ce5e77018fe758f10d
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/wix?keyword=mcpe+city+map+ios PDF link annotation
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/zenazuju-wazakopez-filikaw-miguseke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503524/normal_600d19590b283.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/4124348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372960/normal_5feed33109027.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/mirekujem.pdfIn PDF document text
    • https://bonopabugo.weebly.com/uploads/1/3/4/5/134581776/vuvaluwarovasaraxup.pdfIn PDF document text
    • https://dipidedi.weebly.com/uploads/1/3/2/8/132815933/garalenur.pdfIn PDF document text
    • https://sitakubijilu.weebly.com/uploads/1/3/0/7/130776110/895991.pdfIn PDF document text
    • https://rekozoweno.weebly.com/uploads/1/3/4/3/134364890/1a9518c74dc068.pdfIn PDF document text
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/2be124df89e9e.pdfIn PDF document text
    • https://xonatiwomunonow.weebly.com/uploads/1/3/1/8/131856992/3406067983f.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/3jjjfge/matugubufefodogugeve.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/dopaxagadu.pdfIn PDF document text
    • https://jositaloj.weebly.com/uploads/1/3/4/0/134042718/9061783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464732/normal_5fe6e2419154b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381752/normal_5ffeed80c8eb6.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/fanobi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 5060 bytes
SHA-256: db816f1d5bbefd5ba19028d021bc77a3cbe8fd14da9eaa50d33d9cccff8a3285
font_01_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 10376 bytes
SHA-256: b2de269b9fa2c2f9e85cdd341d7c143552620b0ca68582b444ed80d1e6de26f1
font_02_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 17816 bytes
SHA-256: 40b90998fa5ad73ef100c682513f637b0261872c31a78a01024666c4b0a0db7b

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