Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12df7bda7601ab4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 11:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d2eca27a1b6c21d09c45545a5b37088 SHA-1: a00f00e2485cc703f570335c9f6fb987666ef45e SHA-256: f12df7bda7601ab4891ba0671642d1d222f3e1643fcfd9a0fc8303221ac1b08e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/nefilewuxigejanupebonigod.pdf In PDF document text
    • http://elmbbq.com/uploads/files/tabojofolutaxumekitiw.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/susokilagukavojinuxo.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/47980046971.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/vemekujavuginunavixanid.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/14075151405.pdfIn PDF document text
    • https://n-tlg.com/files/file/77399412282.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/24268564887.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/92158138626.pdfIn PDF document text
    • https://ms2oke.com/contents/files/28124225474.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/zixizidalesumesepoduguj.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/remevuguvija.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/75448487407.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/sovawowupenujumiwo.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/18134105719.pdfIn PDF document text
    • http://client.diffuse.info/files/zusipi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/69591008aa132c4e0280a73b00795efb/92984388357.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109011427353805.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/2142713670.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/93833602919.pdfIn PDF document text
    • http://gojjang.com/uploads/files/fijiwonaterafi.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/98346660318.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/71431090737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mlk+birmingham+jail+letter+pdfPDF 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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 18408 bytes
SHA-256: cc24b47ffbe34d20fa690bc03a212f1ac3657585be9cce2142ab4de3478f546a
font_01_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 11012 bytes
SHA-256: cb69290e32c418bce3bcfe1d769f637355045979856470cae5a84fee0647a23f

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