Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0085875589fb6a…

MALICIOUS

PDF

67.9 KB Created: 2021-02-04 13:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3f4b0fc222586abd0ed5473962d0a9bc SHA-1: e881aaa068073b1439f1f54f5187bc535180f6ef SHA-256: ce0085875589fb6a1c10e6a150b86d3435ed183fd498af77806ac132293c079e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The primary malicious activity observed is the embedding of a large number of external links, forming a link farm, which is a common tactic for SEO manipulation or distributing further malware. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of external resources, and the presence of numerous unknown URLs suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=walker+catalytic+converter+82812 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388422/normal_5febb747b40cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445877/normal_5fe05e1d54904.pdfIn PDF document text
    • https://tedozumezefa.weebly.com/uploads/1/3/2/7/132740670/sobeweja.pdfIn PDF document text
    • http://rubisteq.online/orange_tree_samples_evolution_electric_guitar_stratosphere_kontaktlabf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5fe00af8abec6.pdfIn PDF document text
    • https://fulopovesaj.weebly.com/uploads/1/3/0/7/130740112/9746193.pdfIn PDF document text
    • http://hotita.fun/58727959686n07ye.pdfIn PDF document text
    • http://ewwe.space/25146467418kpfsi.pdfIn PDF document text
    • https://bixavovene.weebly.com/uploads/1/3/0/7/130775743/merijofepi_logodutebavuw_fubanoliso_zafekipikef.pdfIn PDF document text
    • http://sendgrid-de.com/zotipaxevufogosaresalaxouwok7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426813/normal_600582300db8c.pdfIn PDF document text
    • http://1xbets-reg.site/fanuc_robot_tcp_programming_manual01e5j.pdfIn PDF document text
    • https://sixikubirosepup.weebly.com/uploads/1/3/3/9/133997641/tanewubajapabobaleka.pdfIn PDF document text
    • http://bemelegevew.22web.org/gakubuxojejar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikufupok.rf.gd/razujizif.pdfIn PDF document text
    • http://jilutuve.rf.gd/93754134038.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 5232 bytes
SHA-256: 70c40e68f661ecf48753069f4705254578d4cc3ecbfd07e9fc91f45ef40b0022
font_01_sfnt_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 10340 bytes
SHA-256: e80c21afb015948a4f69c8cb2d35f587301f25d304c11c4a475313c7419d9583

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