Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50c2dfb1c0c2c63…

MALICIOUS

PDF

75.7 KB Created: 2021-03-14 03:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fdf8938104900b65a9b03cd9b36e17d SHA-1: d85b4655f26970a2e757eead3be7883d7083caac SHA-256: c50c2dfb1c0c2c6350d5b04e59217649652c86c9db293f80bf1ade4106fd48b4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://midufefew.ru/strik?utm_term=how+to+change+icon+pic+on+iphone
    • http://extraterrestrials.space/79390197328pvfzd.pdf
    • https://fumitofid.weebly.com/uploads/1/3/1/6/131637255/8a8bb.pdf
    • https://cdn-cms.f-static.net/uploads/4408701/normal_601b09534d35a.pdf
    • http://nesobaka9.xyz/adelaide_fishing_report_may_2019tcv3w.pdf
    • https://static.s123-cdn-static.com/uploads/4460255/normal_5fdf7612531f6.pdf
    • http://front-glass.space/chhichhore_movie_songs7a6f9.pdf
    • https://cdn.sqhk.co/pasededi/ggieify/raretexetepus.pdf
    • https://kigijizinelojuk.weebly.com/uploads/1/3/4/8/134848952/wofewezu-rorosif-zetipewegeza.pdf
    • https://tugojomabam.weebly.com/uploads/1/3/4/5/134588125/wamake.pdf
    • http://nubolutlion.xyz/electric_potential_difference_between_two_plateseo03t.pdf
    • http://lnstagram-blue-ticks.com/1357809078e9p1q.pdf
    • http://b4shop.icu/astro_del_ciel_spartito_pianoforte2uem6.pdf
    • https://sigozebuxofiko.weebly.com/uploads/1/3/4/3/134372047/wowikenalimasuj.pdf
    • https://cdn.sqhk.co/libegavezu/1AFHjJS/koxajinujukaxeterubezuxax.pdf
    • http://springtea.space/tap_music_3d_godzilla7zpa9.pdf
    • https://zibitevurus.weebly.com/uploads/1/3/0/7/130776177/59176f9710.pdf
    • https://static.s123-cdn-static.com/uploads/4403128/normal_5fe3f4ce4c8c1.pdf
    • https://cdn.sqhk.co/digipexula/ccTkHU3/diaphragmatic_breathing.pdf
    • https://cdn.sqhk.co/guvevifowo/icjh2gg/samsung_level_headphones_not_charging.pdf
    • http://vannabanyavsedela.xyz/1979423972769zdx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000eb4a.bin
c5cab8401cd9a3f005d6246bd766256d32c47384e04844819f8f3ae826a8f547		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 4944 bytes
font_01_sfnt_off0000fc35.bin
cb234496be888484dc8751cb8f8a0e753630243813def4e7dc3853ae13190a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 10936 bytes

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