Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f9dec655340aec…

MALICIOUS

PDF

97.2 KB Created: 2021-09-20 18:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05ba97f7daa16e6d22c1aba0445e2aa0 SHA-1: d1bf40e31bb2c7ff6384128cecda11125838da8e SHA-256: d8f9dec655340aec1ac9e505190e689d96980b08f47f4cbed1ba78d7a240aab0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and numerous external URIs, indicating it is likely used to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://staropolski.net/Upload/file/62561674.pdf In PDF document text
    • http://kasaitogo.com/uploads/files/1925947045.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/fusiku.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/sabiw.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/84967923891.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130836d81b84---bujifumil.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/jupatufefikarivizum.pdfIn PDF document text
    • https://computerzone.pk/file/woxunakodoveribij.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/70376296534.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/15544329053.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/19930760187.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/dosigidir.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/titiborivaleso.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/fegumezukasepanobunutalod.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/43727779881.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/29721257259.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/56946245945.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/32305105140.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/zarejosefitusibusimoro.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/31638455881.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/49572411074.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/diwesuxudebiwodeto.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/10779294688.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/busatodef.pdfIn PDF document text
    • http://sun-eko.eu/files/file/83667303803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bang+bang+full+movie+with+english+subtitlesPDF 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_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 19464 bytes
SHA-256: 287b6f49a760966d4787df3379294cc98955a608f6e17ee9c77e4774cd95dd77
font_01_sfnt_off000144f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F1 11004 bytes
SHA-256: 0cfe3310d784b07f2a4b20192ecf49592932bcc1b38ec6b867f2dc7827934312
font_02_sfnt_off00015e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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