Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd95ec29037a331…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 06:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ce42fc4f30c32333254068166d46d0f SHA-1: d3579ff82b2a60b4ad17c0a6a1534296f6495135 SHA-256: efd95ec29037a3319ce44dc4c0d02b0cd75ace515338f284205b216415997b25
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The presence of external URIs and the 'link farm' heuristic indicate the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://biodent.ro/m4fm_files/m4news/ck-uploads-files/82517300442.pdf
    • https://kenadong.com/contents/files/95585448921.pdf
    • http://massiimo.com/piceditor/file/81712592307.pdf
    • http://hiroi-es.info/yamituki-n/uploads/files/jufosama.pdf
    • http://cuboni.com/uploadfile/hong202109171035593569.pdf
    • https://hinodanang.com/uploads/image/files/tewowodimo.pdf
    • https://rwd1.thadv.com/upload/files/42845898068.pdf
    • http://engineersclasses4competition.com/files/others/26816401918.pdf
    • http://inciboya.com/resimler/site/files/20205670059.pdf
    • http://chiengthai.com/file_media/file_image/file/belazuselejivifopevemi.pdf
    • https://dogathermalhotel.com/resimler/files/tavugirufepagapawido.pdf
    • http://avision-italia.com/userfiles/files/70480473080.pdf
    • http://gtlmarinefuel.com/userfiles/file/dixomoreripujor.pdf
    • http://canxetaidientu.com/images/file/wujivabukazo.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9499ela053qavmhhhk873u1k89/66336381141.pdf
    • http://tatagz.com/uploadfile/files/38408966403.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3fa724e7744519582e4de761983a9018/379349758.pdf
    • http://showdoimovel.com/files/files/tuxegofarejerixesudefowi.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/kiwikirulod.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/mexalomalozeroxub.pdf
    • https://torbay.ru/images/uploads/file/nopugubuxujafaziforewired.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/netugowumovivafupatevo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+steam+vr
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8d.bin
f7831227ac837da6a163b634773d18c3f22e15695bec68e53ff0eae9e9555f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 18720 bytes
font_01_sfnt_off00010b11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 16792 bytes
font_02_sfnt_off00012328.bin
7b8da5e4ad7b5fa1e6fbf27247eae37b65e4944efa4101d291059cb2fadfc0f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 10412 bytes

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