Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a2a169d9207988…

MALICIOUS

PDF

116.2 KB Created: 2021-01-18 16:34:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d5ce2431a79cb0081ffc098cc6d0461d SHA-1: 263c641551748a77e44f7af07aea47bd39dd44be SHA-256: 35a2a169d92079885a95e131f01caa8a4f0cae3bc00dfd299c476e11c5df205f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?utm_term=great+wall+of+china+history+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449775/normal_5fc8be3b1a98f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f8a92e409d63.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/Vzgjw29/hide_me_vpn_free_download_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366949/normal_5ff0249f3420d.pdfIn PDF document text
    • http://vurenosul.22web.org/brands_hatch_performance_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/vujalenan/eBhcShb/billboard_radio_songs_year_end.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_5fb6c10a1b418.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/vomajududise.pdfIn PDF document text
    • https://cdn.sqhk.co/rodesedaded/7hcHFjg/janozanesiwemuwilanixov.pdfIn PDF document text
    • https://cdn.sqhk.co/dupamotim/jaidWif/fort_worth_stock_show_and_rodeo_event_schedule.pdfIn PDF document text
    • https://nowimadowa.weebly.com/uploads/1/3/4/7/134705132/2847430.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/if9icHZ/spider_stickman_fighter_supreme_warriors_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_5fbee4541db31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369304/normal_5fcd75770ebf9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE9 17448 bytes
SHA-256: 54e6276e1c5597aaffab1008f37f2a7b614166d6a80353323563fe4bca39712e
font_01_sfnt_off00017640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17640 5256 bytes
SHA-256: 5e01c910a57c623bb7c8f94ca16d72616617cdb1015278c491b707500b1192a3
font_02_sfnt_off0001882e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1882E 14928 bytes
SHA-256: 1011d10dd9353bf3ef044c05e594310885ea7849154e90a9cfd9572d15a63685
font_03_sfnt_off0001b504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B504 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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