Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e644660fcff3a4…

MALICIOUS

PDF

68.0 KB Created: 2021-01-03 18:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4b0c04fe218a3f1918a3efec5e0aadde SHA-1: 79aec7986971bddf931a0d67ea626daed1a65d3f SHA-256: 98e644660fcff3a4e44045f9fba6d5f0dd8116d1d51c9453f9ccf1ce4c405709
222 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and link farm attack. It contains numerous embedded URLs, including a critical redirector link to 'traffmen.ru' and a link farm pointing to 'static.s123-cdn-static.com'. The document body, though heavily obfuscated, suggests a lure related to 'Zedge app for iphone 4s', likely intended to drive traffic to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wb?keyword=zedge%20app%20for%20iphone%204s In PDF document text
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5fcb6a3b02de8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_5f9e436f6963d.pdfIn PDF document text
    • https://mizewipexu.weebly.com/uploads/1/3/4/6/134609608/3bf318d9f3bf367.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/6423000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df65f55-533a-42c1-b7a7-6e2936906e60/to_kill_a_mockingbird_chapter_10-14_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b978db61-45ce-4cdd-bb3f-fd56e290405f/sedasopubumaxufip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464f3e42-f49e-4162-a3f5-4338f2ee94f3/gijabisuzamavolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a53e68-2982-4240-a712-8a59c7c4b712/morimof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7100458-e9ff-4b82-be6c-a8c79b6966e2/67084127232.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/70229459652.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/sonic_worlds_delta_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/photoshop_cs6_for_android_apkpure.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_off0000c8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F3 5316 bytes
SHA-256: 52b64fffc306793e27a909d5c7f2c8821e1666703f33fa27a83e122118b53831
font_01_sfnt_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 11968 bytes
SHA-256: ebb6f0907966d7feef7475db6078eca5dc47c1878e4e6d566bfd4ea9d44c5a7a

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