Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec1ef25f3883f1f…

MALICIOUS

PDF

68.4 KB Created: 2021-01-21 14:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 45824f17c3756f09932a538b6b30694b SHA-1: aa9e43e1673ce98417585d0e7bdbcbade44512bb SHA-256: fec1ef25f3883f1f3b4c12818ebaa3a3ef87ecbfaf339c8c084c2d5ed42a53ef
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is designed to lead users to malicious sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=furia%20de%20titas%202010%20assistir%20online%20dublado In PDF document text
    • https://cdn.sqhk.co/puruwedisuma/Xhbeijd/titan_power_7._4_lithium_ion_battery.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/j3oqhdM/run_or_die.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419003/normal_5fcff2d98be29.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/gKhaLji/90257272142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5fb412931e1b1.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/CSvijoL/83038325111.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/5eeaf.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/f9hcic9/moto_rider_delivery_racing_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/ji7MUzG/33668781781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovigebi/bozakivosimelopulobodubuj.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/87396850715.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/design_and_analysis_of_algorithms_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/utorrent_web_error.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_off0000cd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD34 5240 bytes
SHA-256: b475e36d87136a7d5f7b1e08e283b7c9c3d3db1f17d35c653a88058ba67c4246
font_01_sfnt_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 11956 bytes
SHA-256: 05bf9a5bf3c5ad2bba68dfe51692fe06a3100fdd26701750135760a13b7af359

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