Malicious PDF — malware analysis report

Static analysis result for SHA-256 846dec2a3f3cca25…

MALICIOUS

PDF

81.7 KB Created: 2021-04-03 11:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: aa3422ea84c9d463fc7fa9fb1ba0d345 SHA-1: af458a0fb029b1d6c18057ecb73b3508d1dc4614 SHA-256: 846dec2a3f3cca252061872096cccc818d3e5243332dde59b0cc243b50a3cbbd
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/123?utm_term=era+paleozoica+pdf PDF link annotation
    • http://jilavixit.medianewsonline.com/mathematics_iq_questions.pdfIn PDF document text
    • http://namelesssouth.xyz/feropegujwms9.pdfIn PDF document text
    • https://puxofigu.weebly.com/uploads/1/3/5/3/135347112/4503559.pdfIn PDF document text
    • http://cardioactiveuficiale.site/vozavamuvafuzizakq5i.pdfIn PDF document text
    • https://nusubilumib.weebly.com/uploads/1/3/5/3/135347333/5b59ae2.pdfIn PDF document text
    • http://bevurib.22web.org/niroti.pdfIn PDF document text
    • https://gikapatom.weebly.com/uploads/1/3/4/0/134042778/1456081.pdfIn PDF document text
    • http://betifogolejom.iblogger.org/cartea_adulter.pdfIn PDF document text
    • https://rexolofozex.weebly.com/uploads/1/3/4/3/134368018/5451758.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424011/normal_5ff6538be7d1b.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/red_smooth_miniature_dachshund_puppies_for_sale.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://talaxekagaros.weebly.com/uploads/1/3/5/3/135347480/roxitegakur.pdfIn PDF document text
    • https://gerorajowivorem.weebly.com/uploads/1/3/4/6/134686153/7785571.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411491/normal_5fdef3e337ee0.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/xiriwipixufezawozez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosurok.myartsonline.com/lenguaje_corporal_gestos_y_su_significado.pdfIn PDF document text
    • http://muxuzuvom.epizy.com/ninezo.pdfIn PDF document text
    • http://gatituz.rf.gd/gefijazaz.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_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 4980 bytes
SHA-256: cac7c6620c415c24e7158968bda62032a5e7db2ab77f06e3d18a072088601f18
font_01_sfnt_off00011306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11306 11568 bytes
SHA-256: e4ac3ce8132fe5820114e9e76c34f8c195837eb79c880a3a9341a48c64981374

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