Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62dec56f1f3ff24…

MALICIOUS

PDF

85.9 KB Created: 2020-12-21 06:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5495063acdc4ed176a4730dd3e4e4f5f SHA-1: ce449538e3866b629d635f81bf9ce1393cdee580 SHA-256: c62dec56f1f3ff242cd91c6eb68b0cef2fd9919dc1932ff2729e0da5b36fdddc
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate a malicious redirector and a link farm, suggesting the primary purpose is to direct users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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://traffine.ru/123?utm_term=pathfinder+kingmaker+total+defense In PDF document text
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/942672f.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/8985713637.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/xesigeze/island_strum_uke_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/senderos_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/16798587001.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/siguzuzefegewimasiduselu.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/planet_earth_2_islands_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/solubility_of_salts_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0efd7cd1e280355d47a09/t/5fc9474b03adf92d9ca623be/1607026509149/drive_in_theater_riverside_radio_station.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/bakirab.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/30225261102.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5758ee2fce462bcaaab08/t/5fcab5940ae9f772cdf86135/1607120276975/minecraft_mods_1._16._1_mobs.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_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 5388 bytes
SHA-256: c8715860a7b5490b7c6603c4e7616d1bcd26ffc1aab84b21726b98c855d5d9ab
font_01_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 10852 bytes
SHA-256: 80ad1ec64f286048e605fe291635eadc4fecb0ff462c15d06502825f9411d63c

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