Malicious PDF — malware analysis report

Static analysis result for SHA-256 c017f704d89fa88d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 18:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c49391062f6054d8bb06c5ac29df94a SHA-1: 542208d4fe31cf7127646146832dca8dc440b2b9 SHA-256: c017f704d89fa88d8b1ef8543d91d79f5c3014832c9880c00ca03607375c9af7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic findings indicate the PDF acts as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. This strongly suggests a phishing or malware distribution campaign, with the JavaScript likely facilitating the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://queure.ru/uplcv?utm_term=slam+dunk+manga+pdf+download PDF link annotation
    • https://coonvalleycc.com/userfiles/file/jiligukizevafoxijif.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/gebuwafoki.pdfIn PDF document text
    • https://capecoralliving.com/media/file/29255154241.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/zonexoxet.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/96512661375.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zejozefitowororo.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/10900580320.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/38542737672.pdfIn PDF document text
    • https://grandegroup.net/files/54616567723.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/keduzoforatidiposudebidox.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/gugaxeparufevo.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/zafurelolikikepigusikax.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/javoxeduzijunivupabeti.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/sapumofevisokalusurimod.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380c69319b8---82211160127.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/38365640176.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/lamakofabazijajaxaz.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/34691353478.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/nixuwe.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/54984362994.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/xosejosogezoromadujo.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/22509667710.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_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 21968 bytes
SHA-256: 2bea93f8390630f5d95df47488f1ae87d7dd725a1455b88b7e438c826f8a2822
font_01_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 10604 bytes
SHA-256: fa861751591bbea6711fb34a94bbb75162b39e03866f2152f3ea72abcf402f7e
font_02_sfnt_off00012c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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