Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fcb8dee1aa076f…

MALICIOUS

PDF

87.9 KB Created: 2020-12-25 14:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 79a58ae14e9792536705aa7f0d508fbe SHA-1: dec7dc87204ca07e8423855eb64fc5bfcc34aab5 SHA-256: 56fcb8dee1aa076fcc002846951f978ffd7e4a48aec5f90697ec158f38c24828
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 a high ML score and ClamAV detection, strongly indicates malicious intent. The presence of a visual download button lure further supports a phishing or malware distribution attack pattern. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=tamil+stylish+fonts+copy+paste In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5f938c5d623c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_5f924dd27625e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_5f8d7180ac5f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478438/normal_5fadfb2c1740a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_5f8f773d2d27b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5faae7a26f1aa.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://uploads.strikinglycdn.com/files/1079f52a-f0a6-4eab-a4e2-85074c7b1ff5/a_pocket_guide_to_writing_history_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/broken_bow_lake_oklahoma_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/tajosobivelew.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/bhaigiri_2_full_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/expandable_recyclerview_with_cardview_android_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb812d8-2f7d-4c52-a80c-a362c142820e/the_fairly_oddparents_chloe.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/49221789132.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 5208 bytes
SHA-256: 0899bcf8d6188c31757e904b9948ea9fe5d05e75aa54f3a088dd413ef9d8d412
font_01_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 4508 bytes
SHA-256: c1090624355f398859a7bf706907648500e333593de2d6d6aedd43f6da6eeec4
font_02_sfnt_off0001169a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 10972 bytes
SHA-256: f37c1f68bc6f5751a1d7a34d34bb247d93d407f4db3c87025f9041493a8f927d
font_03_sfnt_off00013c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C91 16168 bytes
SHA-256: 17618912937a7c27fdfcc427966e7ab2d4c885237933d212566e10c25e1aa717

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