Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d288fc04df8f076…

MALICIOUS

PDF

71.0 KB Created: 2021-01-11 13:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8e2748292819bc9a194945d72acd2545 SHA-1: 13c1b4339f9157a12ec3318727f181ecfe99489a SHA-256: 3d288fc04df8f07658bdcbb77e495be35082ba4c1eca9ab69df353f5d1660bba
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also strongly flagged this PDF as malicious, suggesting it's part of a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the embedded links and the heuristics suggest an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://gettraff.ru/aws?utm_term=at+last+sheet+music+piano+pdf In PDF document text
    • https://site-1180945.mozfiles.com/files/1180945/centipede_game_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_5f9573735c950.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/dsTniad/degog.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/vePjgT6/usa_today_nfl_picks_week_8_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/R5nTMNH/traffic_run_app_store.pdfIn PDF document text
    • https://ledijomunekivi.weebly.com/uploads/1/3/4/5/134584754/wonomefopoxi_kobedun_garujazimiliza.pdfIn PDF document text
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/7247374.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/Imhjaji/59391780172.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/ximupuv/mapinikunobunikivabaran.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/47124463728.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/thyroid_nodules_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/cb_background_hd_new_2018_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/memojixetufuzezena.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_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 5288 bytes
SHA-256: e13cca5f8b8a5e1c600494cef06f6691b286216170a2772ee4b48240ceb64998
font_01_sfnt_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 10132 bytes
SHA-256: 033f84f22a73271b396ff8fc3f2a2b95ddaf638f96d9df5308237783bf9e5385

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