Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f9a374011c8e2e…

MALICIOUS

PDF

72.8 KB Created: 2021-01-28 02:50:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 710badbf7fc2a5d2385ce47f50121ca0 SHA-1: 28f12e235af2bbcfa9b322c3776fc3f0b70322df SHA-256: d3f9a374011c8e2e2c45a6d80f5a0cb6c7a5a2189a95a6e9c72bfe1ea56dba45
222 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, including links to known malicious redirectors and a large number of external PDF links, suggesting a link farm for SEO manipulation or malware distribution. The presence of a 'download button' heuristic further supports a deceptive user interaction. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/wb?keyword=bubble%20popper%20app In PDF document text
    • https://static.s123-cdn-static.com/uploads/4377647/normal_5ffff5be69d9a.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/1418721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490370/normal_5fd830c80a612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fd30885eba8c.pdfIn PDF document text
    • https://rominekajamarol.weebly.com/uploads/1/3/4/0/134040464/goxonevobanufaj-kunazaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377401/normal_5ff39c984fdaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_600a60ec39afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_5fd798e142ded.pdfIn PDF document text
    • https://dapalaboz.weebly.com/uploads/1/3/0/8/130874192/b38113.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489045/normal_600098fd9b9de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fcb1db1d11e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499636/normal_6008f59d14ba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501027/normal_5fd7dd7141512.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5fcd82971ed9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368235/normal_5feea63243040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_600a9e338ce73.pdfIn PDF document text
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/buralopudesutebi.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/daraniwekamidir/suninupejudagoke.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/vezavufobamosovul.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_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 4824 bytes
SHA-256: 806bbf029d84cd2e0e035351e6cd08978cf4bf8bea0b9e410886ccc73804d76f
font_01_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 11032 bytes
SHA-256: bed25adea19e5b2fff47e67854725e1e789398b1bea2de6df4854d1a85d35480

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