Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52510883ce7bb33…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 12:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fce39ec81789b6859c1c79a32d7f0219 SHA-1: ede72b2ae6ea789e4da96f38b5557c7a2c6de783 SHA-256: a52510883ce7bb33c1de4f0ea104b583b120e02a2c73a5edc0b442c03f37f98b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, some of which are hosted on disposable domains, and includes heuristics indicating a lure for a password-protected archive and a fake download button. These elements suggest the document is designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dottoridegregorio.it/public/file/3815163677.pdf In PDF document text
    • http://artgrafika.cz/userfiles/file/94737375390.pdfIn PDF document text
    • http://davcpundri.com/css/file/86937281422.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/70953760581.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2b3b6d61---vezegajobilozufosofi.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/nawiwepaxu.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/14763598351.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/18598998890.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/87208511472.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/55433676654.pdfIn PDF document text
    • https://atlantidegattico.it/file/pobuwewojezan.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/38040905195.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/megoputabinefewiw.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/84272317770.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/70222578592.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/vegolujag.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/57303423788.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/88996879641.pdfIn PDF document text
    • http://hkparkkonutlari.com/image/files/39188053992.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nalubi.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/44248522251.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109110645131693.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/97575015600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=temp+mail+premium+cracked+apkPDF 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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 10340 bytes
SHA-256: 3e82878941dd3d489481aaeefd09542b9719666daa46e8c419c1ebebf9d2323d
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 18444 bytes
SHA-256: e5c31d5b672a4ea368071a57912cad57180b8c911be12f85db9e7dc0466f92cf