Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7de0cb6aebb6b7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 02:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af8c2242fb533ceb737ebe22c37347a1 SHA-1: de4b3d392f0fd02abde27c701c0d8a0d9bad4b71 SHA-256: 7f7de0cb6aebb6b7eea1779d201e30e3a9cb6c29a860db525281105fbc9669dc
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=how+to+crack+screen+lock+pin
    • https://cqc-material.com/app/webroot/userfiles/files/8863423861.pdf
    • http://laros.cz/UserFiles/file/61935407298.pdf
    • http://ingfrimale.com/userfiles/files/50426579388.pdf
    • http://doradcyprawni.com/images/pliki/46531794333.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/gigerakegogowivipivaj.pdf
    • https://garnet-medical.com/userfiles/files/27276897714.pdf
    • http://skonasystems.com/userfiles/file/pabakagukemivoxaxi.pdf
    • http://idolyokocho.com/js/ckfinder/userfiles/files/2688279057.pdf
    • https://ehbo-oostkapelle.nl/userfiles/file/84898817414.pdf
    • http://candleelectricals.com/uploaded_files/userfiles/files/3493517959.pdf
    • https://ww150003.linebot.net/upfile/files/20210907041402.pdf
    • http://ahrestygz.com/userfiles/files/20210918_094411.pdf
    • http://bosch-elektronarzedzia.pl/catalog/file/tofukagadep.pdf
    • http://refah4ter.info/basefile/hotelrefah4terir/files/41539745988.pdf
    • http://pacemakerpressintl.com/uploads/assets/file/4270890339.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b81191d4c---wozoxuwudi.pdf
    • http://trungtamsangloc.vn/uploads/ck_upload/files/59905215633.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/52237420985.pdf
    • http://dispensapertutti.com/userfiles/files/84497387561.pdf
    • http://braghieriarchitettura.com/userfiles/files/jataxowufirokogiz.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/tesufatudafoxojafom.pdf
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/66338077645.pdf
    • http://security-m.jp/tool/images/file/mitufebujawesiro.pdf
    • http://ridendo.cz/files/file/pepezofovuxizadu.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355cffda7b2---93513495456.pdf
    • http://njbeihang.com/uploadfile/file///2021091805594179.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/dakativanifegivuraretasef.pdf
    • 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_off0000de8d.bin
ea0d03bccf6666dacfd372479e38f374a856232230e343f31d60034ce239c502
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 10536 bytes
font_01_sfnt_off0000f6ac.bin
7eccd97ec168821e3d4fb4fd8f8c4ff38446eeeccc3c94969f21e867da26fc86
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 17888 bytes
font_02_sfnt_off000124c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 16792 bytes