Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8153849b23741e5…

MALICIOUS

PDF

69.8 KB Created: 2021-09-23 01:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d75b9ee3ed84f2f1c645586971190423 SHA-1: 7ed6e0b84ddef7dfb1f7bac1dd78d09a3b3eeef9 SHA-256: e8153849b23741e54147a333b4a161fd31fc897f959658fb2bfc71f4bac49bc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection suggests the PDF is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://architettoletiziamasciotta.eu/userfiles/files/50527826763.pdf
    • https://senegal4d.com/contents/files/33916627098.pdf
    • http://koala-al.com/d/files/niwelipexoluneguwejo.pdf
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/lomidefotubobu.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff66834561---mowakenepebipapibe.pdf
    • http://restokrat.info/userfiles/file/86841714304.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/98144535690.pdf
    • http://sartoriaventurini.com/userfiles/files/latifuxotixoxopo.pdf
    • https://discovercefalu.it/_data/images/file/56682019729.pdf
    • http://allineers.morefriendship.com/upload/files/pufumobasumakopiwol.pdf
    • https://caribemed.com/userfiles/file/98445923130.pdf
    • http://hacoauto.vn/upload/files/84346876758.pdf
    • http://scouttautomotive.com/editor_uploads/system/files/ziwigegonopudif.pdf
    • https://dnm.tw/uploads/files/202109080209503510.pdf
    • http://cbcom.eu/ressource/site-image/files/57120156094.pdf
    • http://fullerton.kopanramen.com/uploads/files/legex.pdf
    • http://xprchemical.com/upload/files/zuvawebutevipomago.pdf
    • http://weifong.tw/fckimages/file/jadibulij.pdf
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/52796419241.pdf
    • https://heatingboiler.ca/fck_upload/file/jetijoliligaguwifesi.pdf
    • http://herve-coiffure.ci/files/puluxixitikakowef.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146f990c6529---lenixatokavipojasire.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=real+bike+racing+hack+apk+download
    • 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_off0000b17f.bin
ddf1a6d6b7c174548758fcbfb085e46daa4854a0ff04a8d224bdc0330ce31a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB17F 10892 bytes
font_01_sfnt_off0000ca2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2D 16792 bytes
font_02_sfnt_off0000e23f.bin
f7b186da785ad2098056c980117719db30ca478e96001679d95cfd449f8da257		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 15476 bytes

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