Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8336eb39216bf48…

MALICIOUS

PDF

89.4 KB Created: 2021-01-01 04:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9d79f409d867c37b8afa1580bd30bc24 SHA-1: da254deec26ad7ddb57cb08b4c8199bb4799139d SHA-256: e8336eb39216bf48a89f5ecd0f012bbb1ec0b20fe49656d38ef879fd03fef6ac
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external resources, which is characteristic of a link farm or phishing lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'traffking.ru', indicating malicious redirector infrastructure. The ClamAV detection and ML classifier further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • 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/123?utm_term=justifying+circumference+and+area+of+a+circle In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5fa21a7d57191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454055/normal_5fdf016600696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_5fda8cd4691ed.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/rexuzemufapi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5fddbd587c1bd.pdfIn PDF document text
    • https://cdn.sqhk.co/tuteremekome/bhdjegd/99904666662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5fa20a69b3f68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5fb7677c5c3ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5f96e9588664d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_5f8985cd885fe.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/ighmZXn/how_to_find_shipwreck_island_raft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5fe915c4b84a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5faef7ecbef99.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/c658d20a-d007-4793-8608-10bd8907382b/divine_name_king_james_bible_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fab0661-2f17-45fe-b8fd-6b14fd2a14e6/tiwilif.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_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 1708 bytes
SHA-256: 2a0319cc902936760e3fd10984523d7c8567649a743b61ee64f427e966c2d4cb
font_01_sfnt_off00010740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 5432 bytes
SHA-256: 0016a521bd24f4ae6b8d2434c78e45e7898827a5cf5d54b61c731f801156db37
font_02_sfnt_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 11748 bytes
SHA-256: 126a7734a62fae7043a94060fb43857066991189491d2b46e4935696371f0f49
font_03_sfnt_off000141f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F5 16208 bytes
SHA-256: 3b880ae8b046db85d3eebc4a95fc0ab9d4b5f015cb69e0a38438a493accdac43

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