Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24f407ca55dbfd1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 08:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37545d6935fa99088e64bc64cabcc23c SHA-1: ef72893f27eda084fa3a665c449e4765d49a6688 SHA-256: b24f407ca55dbfd1fb52ddadd1b1c5f486b48c1735942aac16ab29a8bb522378
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains instructions to disable security software, a common tactic to facilitate further exploitation. It also embeds multiple URLs, one of which points to a raw IP address, suggesting it is designed to download and execute a second-stage payload, likely another PDF or executable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=cricket+19+lite+apk PDF link annotation
    • https://dreamscapes.ca/dream_scapes/userfiles/files/nowizixaketosogimetufok.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c45159fb7---27891341305.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/50764826367.pdfIn PDF document text
    • https://matratva.in/userfiles/file/49575660306.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/nexuzozutogivufe.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/19920411006.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/sagizajozepijinubuwobi.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/87986029029.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/57164522264.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/xezapub.pdfPDF link annotation
    • http://zl369.net/userfiles/file/30045829135.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/20983029693.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/gefik.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/jofomawe.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/matowidoxonavuf.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/govafoputiw.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/wililevap.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/25787743050.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/15122176492.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/jikuloxodefirajew.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210919095716.pdfIn PDF document text
    • http://master-br.ru/img/file/sosezaweloguvofujet.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/govojeniwiz.pdfIn PDF document text
    • http://preiss.at/upload_files/files/kisozuduvevufow.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_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 18572 bytes
SHA-256: d776eb046c50397213acc614013442c81dfd13f8041af9a8c7b93a21922165da
font_01_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 10320 bytes
SHA-256: c093c41aa283a1370439ce77c5be0ee1a2a203f5cbce130422ae9df601761c3f