Malicious PDF — malware analysis report

Static analysis result for SHA-256 caab086407f63838…

MALICIOUS

PDF

67.9 KB Created: 2021-01-21 17:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: cd160826aeff1adecb6cfbede9d6c300 SHA-1: a83b050b1b92dc25216d2f165fc69da5466e16e7 SHA-256: caab086407f63838fc92faf19f6a578ab22aca373a4e63d71ce150b1b8c78bd7
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL likely serves as a lure to download a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/aws?utm_term=cello+and+violin+sheet+music In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5fdb6be924215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424981/normal_5fc0307a95f61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486987/normal_6002972d91440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5fe34ea3e4fa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_5faf032661981.pdfIn PDF document text
    • https://cdn.sqhk.co/dobexesi/biepJid/53487655299.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/KhbNdid/keyboard_hot_swappable_switches.pdfIn PDF document text
    • https://cdn.sqhk.co/tijovomiv/iiabrYf/ball_and_bricks.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/iiiheJP/fixolasibiwipiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_5fb883b55a0a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f9ce429e7304.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474445/normal_6008ec1186069.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/ggicib7/android_system_webview_apk_old_version.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/hcjfmjb/gtr_speed_rivals_online_or_offline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491152/normal_6001aa4286298.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/hifRhgz/viruses_vs_bacteria_differences.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/dakebesuvum/adding_text_to_gif_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/new_bollywood_movie_2018_free_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/66826345537.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_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 5048 bytes
SHA-256: 57b0a6d39ca97e7fa87c0b1fe9b192a02cbe99f1231d02846eacb371562af285
font_01_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 10344 bytes
SHA-256: ae31a6417017f81a09ae0ce5fa4270d56d801f8640c59ad6becffee0f82bf0d7

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