Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7835bdd2799e16d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 05:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 833b41d8bd3f22261e403ce13a841632 SHA-1: e8015ea44552d2e9792d079a0a2f214490ae801a SHA-256: f7835bdd2799e16d8883f1d8343788a48ebeb33769ddaffa6a5d8854a3d91152
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external links, many pointing to disposable domains, suggesting an attempt to host phishing content or distribute malware. The presence of a download button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=gloud+games+premium+mod+apk PDF link annotation
    • http://kimdaiphatsteel.com/Images_upload/files/wusapotorojos.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/tumikakaseposeki.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/6414537097.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/91737063807.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/gilokitevixabaloxe.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/38061406634.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/996500024.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/86350209226.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/kinujagutigekuxekobubulev.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/af80390fb6acc96b5b1de3a2964f4187/26552056892.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613841b170d22---9645939447.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/50379636680.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210910091001.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/32613297320.pdfIn PDF document text
    • http://jadeite.ru/images/file/34514879890.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/segefuxefekezow.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/sejekuxulujotavusakax.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/gakeboguloduzufovubi.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/romekamaxoje.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/pogegalotigigi.pdfIn PDF document text
    • http://runhouchem.com/upload/files/fibivu.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/semivoniveridesimipaxiga.pdfIn PDF document text
    • 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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 18100 bytes
SHA-256: 9d96618f47d9e848c9ef2660a6f1ca3c4b7a880edf326aec1760ceeec8fa8abf
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10764 bytes
SHA-256: 3e148caf8bcd706a5683a99011fc6f38f0c0c67f3bc9fac27f638c7afbbe3e00
font_02_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1