Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1643d0a7a4989e2…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 12:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 98663378352e58f7b6bb086079caff87 SHA-1: 0127cd221c5c36a21b5a0f65167266721569841b SHA-256: c1643d0a7a4989e285e467de72ed61098e01ee921e702371d14d272fc9db5516
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is structured as an image-only document with a click-outward action, typical of a phishing lure. The heuristic firings indicate it's designed to trick users into clicking a link, likely leading to a malicious site or further payload download. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3bb268f1---89280403873.pdf In PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/99424231734.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/xexewuresi.pdfIn PDF document text
    • http://eur-idea.com/userfiles/file/vininewifumo.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/todigelozog.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161366542996a8---ralunebu.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/75884508638.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/xezogovikofujivinapimi.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/potojo.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/gotoraxez.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/25416619364.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16150eea36e9d9---sagatapuxedo.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210903_3B2BFC6F8590A7DB.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/lobukarileki.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/91653002995.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/4068523126.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/65630021385.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/beketadu.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/66516974699.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/74116682706.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/falazipunemefidap.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/matasajawuxeto.pdfIn PDF document text
    • https://kaparatt.com/images/File/zevorabebomudasatisatado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=patterns+of+exposition+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_off0000ad41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC558 10548 bytes
SHA-256: 6909dba6db78ad6b8a7264554e89e9283add815b91050a5cc2da8fa52d278c36
font_02_sfnt_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 14488 bytes
SHA-256: 41ec487e11a27dc07505d00f15e9307b8899a2e8035ad46b4281575936e96e6e