Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b72d7adf1c4d99…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 10:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d70557f091d35b9bc28374567b2ad71 SHA-1: 3b0a283d913f6c63cbe1dc39f167e6d588b7d336 SHA-256: a6b72d7adf1c4d99444bf8a90399e99bed9909a2e537298858e76aca4c12645c
134 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, with a critical detection score. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also acts as a link farm, containing numerous external URIs that likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://peoplefineart.com/assets/202109/files/20210907024703765133.pdf In PDF document text
    • http://ehomeforeclosure.org/images/file/dizavig.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/nesalikaroxevivafe.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/dabagumakegivapadexaga.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134577af0d6a---81264640535.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/85475421811.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/gegubakofesimabamo.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/26275909707.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/17356923058.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/79595875060.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/31953934477.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/27204274399.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/loxelevawopode.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/80356407734.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/meselebi.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/vesitojipepibufiribar.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/livebukiwizajefatum.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/53609646811.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/50757273566.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/19776327142.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/gaxukadedijuxiwujil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=juegos+galge+para+androidPDF 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_off0000beeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 10560 bytes
SHA-256: 0a77eb44d24da6d4f4aa2fc5f660ddc9e295ae03774819bb089d3c47f81817c7
font_02_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 18244 bytes
SHA-256: 69da3f59fb850a58bcb00ad1ce04822f0617924236f35c050e78ee184569427e

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