Malicious PDF — malware analysis report

Static analysis result for SHA-256 235ab25faf5c45e8…

MALICIOUS

PDF

72.6 KB Created: 2021-01-05 21:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 01837e54120f4496d04abfaef2e68959 SHA-1: 431767260b6fba3f3fac87ba6093e28977274cb4 SHA-256: 235ab25faf5c45e8a31c1b77d8623abbb02fd09596af4356d324acb272b6b7b6
162 Risk Score
Tags
free-cdn-ebook-manual-lure

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 'traffmen.ru'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The embedded URL is likely intended to lure the user into clicking it, leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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/aws?utm_term=ajit+bharti+memory+trainer+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4469128/normal_5fb381a9eb03b.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/vgeicgj/freeze_transunion_credit_report_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451949/normal_5fb5d4fe3382e.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/LyjgFid/squarehome_key_launcher_windows_style_apk_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5faa64f58fdcd.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/gdijrHD/35945343373.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409799/normal_5fe2253911583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/1279820904.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/braun_strowman_theme_song_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0607e2c6-ad98-402d-a15c-8f4a72fb6934/techcrunch_disrupt_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 5440 bytes
SHA-256: 5160f2514995071ea584d59ff846ff116021f8ac7215872e013efda82316d163
font_01_sfnt_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 11228 bytes
SHA-256: 232ec369bc71b49e7d2739da25bfd9afde69235598edf9488b4fb5ccc618c27c
font_02_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 2908 bytes
SHA-256: 03ed8e77fe497f52f507534d66a610a8c515c2c51c2c5ed259a77037d7717465

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