Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a4aa8661900661…

MALICIOUS

PDF

110.7 KB Created: 2020-12-16 20:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f55e3df1ead923ed16003f8f4c4de573 SHA-1: 7374fc7b71f6a159f0b188a5f6bf5de63994f3d7 SHA-256: 43a4aa86619006611e68fb866907a9c23fe9f43058412e23f42c5fef8fedb530
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/123?utm_term=fat+diminisher+system+free+download'. Additionally, a machine learning classifier strongly flagged the PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The presence of a download button lure further supports a phishing or malware distribution attempt.

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.
  • 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://traffmen.ru/123?utm_term=fat+diminisher+system+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5f9ee5a5780a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5fd9d78fd3d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_5fac240d8f51f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_5fd6127c88374.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5be7c27a199023ad675ed/t/5fc8cd3a094cf7617dc963cb/1606995265889/video_apple_tv_airplay.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5313f104edf1d779d1ce4/t/5fcea15ec463130800a21dd5/1607377246175/guess_the_movie_using_emojis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28536e9c-9081-4bd4-8561-c21ca6f2d3d2/77027913527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f067262-cb3e-4b7e-8c43-d0d5dc403097/66516837668.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/16485757120.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b2f8c30a162e0c735f4a/t/5fd69489d654060362cfd707/1607898249629/12095218055.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6751d27a199023adb75cf/t/5fd09cd475f5e504857590a7/1607507157328/hill_climb_racing_download_for_pc_malavida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae7f6a4-dd8c-4d5d-80bb-7936335bb607/conalep_playa_del_carmen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75939513-30cd-42f6-b52a-292dd9593291/nalug.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_off000176d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D2 5296 bytes
SHA-256: 312c05cdeaeba7cb0815ff49516d2b3dabc7e838c577b45aecee50312351cafb
font_01_sfnt_off000188c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C4 10732 bytes
SHA-256: 666b879edf9fd41e169e34c0cd1ca38bbd9ebacadcf699e747c3777bf98892a6

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