Malicious PDF — malware analysis report

Static analysis result for SHA-256 46dd794e571f102d…

MALICIOUS

PDF

65.4 KB Created: 2021-01-25 12:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e69304a7ea4bc4a3e11a8d78affdc876 SHA-1: e77d08057d49dd57237906d2c1e0b80306987f04 SHA-256: 46dd794e571f102d200cc916582d2f358366e73b15f1fe8ee9fb1665a9fd0f68
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a link farm and redirector, with numerous embedded URLs pointing to potentially malicious or spammy domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple redirector links suggests an attempt to lure users to external, untrusted content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=siam+safari+nature+tours+phuket
    • http://dfwshootersupply.com/empires_puzzles_epic_match_3_apk9wy4c.pdf
    • http://wgathering.org/one_god_one_baptism_bible_verse42kh8.pdf
    • http://upgrade4me.com/75012961780z7noi.pdf
    • http://50off.pro/retiguxiyr43d.pdf
    • http://koreanluxe.com/38737945197pnxgn.pdf
    • https://cdn.sqhk.co/dofexoxev/hbOgjLN/limafexaxu.pdf
    • http://bluetea.space/how_to_do_acrylic_nails_at_home_tutorial3l2pu.pdf
    • http://tur8osale.site/bolimesuviregesosekek44xyc.pdf
    • http://hookup681.site/venemabonifebewi9um.pdf
    • http://ctuxuu.com/81833937567hxj9h.pdf
    • http://busforpay.online/85344679860w51wl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dipijiz.epizy.com/addition_coloring_worksheets_for_kindergarten.pdf
    • http://tufebogepamik.rf.gd/akrama_sakrama_application_form.pdf
    • https://s3.amazonaws.com/wizuluworafid/5723361495.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/paint_brush_tool_photoshop_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c22a.bin
2c8a47e09588d47647dfbad5f986aa2ecb29c9e579fa859b0229c66c05ef6724		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC22A 5276 bytes
font_01_sfnt_off0000d3f2.bin
09aba34b3847951aa23ab8e950cc288b1f99c29022228cb7ca34ad543aec0485		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 10824 bytes

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