Malicious PDF — malware analysis report

Static analysis result for SHA-256 7732178ba250eae1…

MALICIOUS

PDF

77.5 KB Created: 2021-01-02 14:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bab6dbf20af76703c646e72eb85bfb75 SHA-1: 71ddd132560a1f43e928f6a2b87d77a8b8192893 SHA-256: 7732178ba250eae168a8d8440c64656102d4f0589871fc52ee0ed7f6c520dc33
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'book in tamil free' and 'wkhtmltopdf', suggesting a lure to download potentially unwanted or malicious content disguised as a free book. No scripts were extracted, but the presence of numerous links to suspicious domains is a primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://traffking.ru/aws?utm_term=agni+siragugal+book+in+tamil+free In PDF document text
    • https://cdn.sqhk.co/vumivatuvi/haJhedO/39549521157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5faaa4c984669.pdfIn PDF document text
    • https://vuzanodunujow.weebly.com/uploads/1/3/5/3/135350892/3576961.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471464/normal_5fe5fb4f18f06.pdfIn PDF document text
    • https://cdn.sqhk.co/miviluwulux/eCyjijd/nfl_games_today_schedule_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/WJtj2hb/4_pics_1_word_letters_4_daily_puzzle.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375509/normal_5fc3f2a1a714e.pdfIn PDF document text
    • https://cdn.sqhk.co/vipatemeluti/H7Pichd/bugsnax_review_polygon.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/3e735394-4d52-40a2-81c8-11134662a1df/42836871933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06e10d1-946a-4ece-9196-526875915d3e/15947142653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05cecfcb-a83d-49d9-93df-52d616ba05ea/sazogadezetereza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fa2610-8078-4f87-83d0-871cb34cb822/i_hope_this_reaches_her_in_time_free.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_off0000cebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBF 5280 bytes
SHA-256: 0f2240e0dd275adf0225878ea5fa9ad557effdeba669a7245ada0dc665ef9433
font_01_sfnt_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 14532 bytes
SHA-256: 9991363826a0e765fb54067e4b5f667008530e6fe789c9296697bd4569a5e5fa
font_02_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 10536 bytes
SHA-256: 64f1b8ee69d3ee3283748a832bd649ed298594ab791958d03fa585527f3b2814

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