Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56d8f69c8e8304d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-13 00:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9787c1e7631a5a289051a91ac0a42710 SHA-1: e396f3f089672da34d247ea3780ff90db0e79f35 SHA-256: a56d8f69c8e8304d5819859f970b91a924cca342271d6549677f199d53866c1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous distinct hosts. The embedded URLs, despite some being marked as benign, contribute to the overall suspicious nature. The file's structure and the presence of many external links suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://bangkokmagnetwire.com/ecodev_test/image_system/files/56335617804.pdf In PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/silosisugot.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/95912852223.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/tejuguxutikanukalufipin.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/84428793031.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/gerodobesazilafabuv.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/43573532273.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/37091745770.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6683d0b76---16229247526.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/taxuvuwejagimolaxaviwux.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/42247325409.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/42035630458.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///60225915070.pdfIn PDF document text
    • http://malifer.hu/upload/file/18102963232.pdfIn PDF document text
    • http://elitvorota.ru/f/file/5937217555.pdfIn PDF document text
    • https://ags-car.com/upload/files/99845911514.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/tukodomobiz.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16134cc87c713d---60743361091.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/99419614357.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/71563074437.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/zededula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=resident+evil+4+ps2+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 17148 bytes
SHA-256: 2bd01464f348d72f0499a05e22136f4be2af7532b5191d286f3a5eeb97a07a3a
font_02_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 10568 bytes
SHA-256: 99c49db4ecf37d6e55e927e63c2c629a840a2103e4b6fa0c348fe356142a3d3e

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