Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4311887c247f551…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 01:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2d530607e90aaff2db524a9b446ed2b SHA-1: 2378c3a799b88aca2b9a76578fff0d0d10c2dc47 SHA-256: a4311887c247f551d9626628b71828debc75461a41b2bc512607bbcae0470a02
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious. It employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common tactic for credential theft or malware installation. The document also contains numerous external URIs, suggesting it may be part of a larger phishing or link-farming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=syncing+my+phone PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465ecc1965d---13898153617.pdfIn PDF document text
    • https://forumsevens.com/images/file/41239876184.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/zizeben.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/75182708735.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/fosikaxikamodolodasuxetux.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/digojoravapofebe.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/tewapadezu.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/vipusumijabedu.pdfIn PDF document text
    • https://dm288.rs/slicice/file/29615671334.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/kufiganakobunuxaboki.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/fanakotasomawagunotu.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dotuvu.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/27564724761.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/99844523322.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/23847677332.pdfIn PDF document text
    • https://xaydungkienthiet.com/upload/files/sinadigikesokot.pdfIn PDF document text
    • http://tajilin.com/upload/files/13845048958.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613314557a6e4---guwogawidepa.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/bemelejoxobikolamali.pdfIn PDF document text
    • http://ocung.net/img/files/53106661580.pdfIn PDF document text
    • http://peoplefoster.com/pliki/jujesoki.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/87992468665.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/81319394326.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/74019367957.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/gijobibapower.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_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 17364 bytes
SHA-256: c098e498f563069d4a80390237892fe3a58774899ba9f1298c80ded6301d7360
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 10436 bytes
SHA-256: 3486d32ba2c964bdf1b5f751203141dc95c849fbe82cd91fcf34251b3d1642e1
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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