Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bb8785233d580a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 00:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20caca79794ba653c3da722c051cd10b SHA-1: 4b4ffbe716f27310a12981ddaa0c8bd722ed3bf0 SHA-256: e7bb8785233d580ad5b723b564dad659113eebe52a5c2e16a4e9acda8acdf65f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. The document body is heavily obfuscated and unreadable, but the presence of embedded JavaScript and the heuristic firings are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agisma.ru/files/pages/files/53813575998.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/13257775443.pdf
    • http://sklepjola.pl/userfiles/file/limapu.pdf
    • https://sicurezzaips.it/uploads/file/raloxeviwigafapu.pdf
    • http://veraschwemmle.de/fckdata/file/79257732939.pdf
    • https://muzeumkonstancina.pl/attachments/file/20429309102.pdf
    • http://pscemetery.com/userfiles/file/89487908096.pdf
    • http://atsolution.org/userfiles/file/20210908064729865527344.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/kegupogaligojetawopibudef.pdf
    • http://getwealthythisyear.com/ckfinder/userfiles/files/83970271033.pdf
    • http://www.europesolidaire.eu/userfiles/files/71303485663.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/werotulesipobod.pdf
    • https://nedimgame.net/calisma2/files/uploads/powigumogadiregekexetiw.pdf
    • http://gmei.lt/ckfinder/userfiles/files/88829952532.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead94edfd9---penikifedan.pdf
    • https://canevastoilestjean.com/upload/editor/file/ketetibataxer.pdf
    • http://hitmet.slektenkaas.com/bilder/file/6142445645.pdf
    • http://nwatchonline.net/userfiles/file/60732221472.pdf
    • http://cmtoolsrental.com/user_img/files/15390968263.pdf
    • http://2990592.ru/ckfinder/userfiles/files/91660086653.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/32197165108.pdf
    • https://driftwoodcc.com/userfiles/files/990988518.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/5841455165.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/77462309286.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=n64+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b939.bin
9b4ad47a74b450c1fa03e237094fa40badb1dec71bc581a0fe00c1eb8b69dbce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB939 18768 bytes
font_01_sfnt_off0000ea16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 16792 bytes
font_02_sfnt_off0001022d.bin
af2e394c34a9be8cbce66d7162d03368b52e242bb8761194a4c509db45edaab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 10196 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.