Malicious PDF — malware analysis report

Static analysis result for SHA-256 18eda6d903e446f8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 22:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f9252d8a5eb1c2e5a2e85c6ddcc83de SHA-1: 4affc2bd81ba3a7501e9f50ff572150a1b31a08c SHA-256: 18eda6d903e446f802dc71c840230ea99991c1ec533ddf185e8b721902fd9350
154 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, which are indicative of redirection to malicious sites. The file's structure and the presence of these elements suggest it is used to lure users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=gta+iv+android PDF link annotation
    • http://murasakijr.com/uploads/files/13128434209.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/duripunerirituk.pdfPDF link annotation
    • https://bibonatura.hu/ckfinder/userfiles/files/18579139570.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/23062311629.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/depatotubumufabeluge.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/19887513374.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/45524450863.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/bovezijefilamara.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/75849233027.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161383fe78536e---fifolomalu.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/27523340770.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091215540264.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/15877428552.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/47395748230.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cdb5789d2---figatufafaposesipug.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/5607137690.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/07233219821.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/60679114475.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/xilujumatusegaximel.pdfIn PDF document text
    • http://varvshistoriska.com/file/75838396158.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/88493430171.pdfIn PDF document text
    • http://ahchala.com/img/file/kezuginumu.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/30917870952.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/nubovew.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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 10000 bytes
SHA-256: b700270bd7120bf9af6ff06c67889055ca29a9f578342abcb899a68cd76471e1
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 18972 bytes
SHA-256: fa8c71814851cfbeb3a47fa48eadf8f62fbb927b1f2e8abb973f699877089253