Malicious PDF — malware analysis report

Static analysis result for SHA-256 054dbb2d1ccd0099…

MALICIOUS

PDF

78.0 KB Created: 2021-10-09 00:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 08dd33499b24e3bb870a138e03c234be SHA-1: dc3129706bc1d405a9aede010899c5589c95f1bc SHA-256: 054dbb2d1ccd0099636f3a09cd4466f5c8a13bb4104a60c186d27cec2150ac6f
174 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating embedded JavaScript and algorithmically generated URLs. These elements suggest the PDF is designed to exploit vulnerabilities or trick users into downloading further malicious content. The presence of numerous external links, many on disposable hosting, points towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://parkerboat.hu/js/ckfinder/userfiles/files/19542189914.pdf In PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/71652213437.pdfIn PDF document text
    • http://trevorhannant.com/98766817394.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/wanaga.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/22814117095.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/savavinujefakuvejetunimo.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/13281568541.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/70d4425149e9367db9089255cf58eefc/dokupamatetelalovaga.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/xotegatetoxipefiduwu.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/45802117243.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/tebaw.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/dunijagakadanisej.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/wurodufuluw.pdfIn PDF document text
    • https://bselink.com/userfiles/file/96484794620.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20211004204144.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/tamilamefofoxidasubepades.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/50558608682.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161523d34974f1---96542640872.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/4412491316.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1632506211_2bd0d1f16b.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/5178422744.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/jajexopizop.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/dajojanu.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/69184487248.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/75457252626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=taylor+classical+management+theoryPDF link annotation
    • 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_off0000cc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 17500 bytes
SHA-256: eb6867ae8e35b6ee7ffe0c561b6b8b5104f1aac7573d369de64979da006f98d0
font_02_sfnt_off00011158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 10752 bytes
SHA-256: 02a16ab11c7a093ceab3249b52b87ff58ca4e2205d5d2556fae99a6f01b97d07

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