Malicious PDF — malware analysis report

Static analysis result for SHA-256 543d21afd3ecb458…

MALICIOUS

PDF

60.1 KB Created: 2020-11-24 18:24:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6f75492c0519392d94562faa49f85dac SHA-1: dc736502f5e18bee9c684f7583494bc53b42e00a SHA-256: 543d21afd3ecb4580011253d9d38fbee21161aae3979ba5a095b3c7ef54cc965
156 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/strik?utm_term=position+time+graph+to+velocity+time+graph PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f8fcb6eddc52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5f8ec4e73b165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_5f998cba64a7a.pdfIn PDF document text
    • https://loropigofog.weebly.com/uploads/1/3/4/5/134595907/bawerajubon.pdfIn PDF document text
    • https://peketavapi.weebly.com/uploads/1/3/4/3/134331612/7c400b9cb04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5f9e7b224b725.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/minabiwa/48911007300.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/leluritajafif.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/learn_german_vocabulary.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/prayer_before_starting_work.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/53159833382.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/15765367591.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/zinenilapanamumon.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_off0000b1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AD 5508 bytes
SHA-256: dd003b96af7616eb0b308cd0c878e06f90054fb7d073ac873d8c9d7a84423b66
font_01_sfnt_off0000c44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44E 9172 bytes
SHA-256: 848de0678b293e3287393907e03ad46e7b9169f81ac388aaf141dec5c1eb7dee