Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea41be969629eecf…

MALICIOUS

PDF

73.5 KB Created: 2021-10-05 02:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 12ed6e30b5f562ad190a31413a252014 SHA-1: 82736b2fcff580ce42f7391f33dbd240e5537079 SHA-256: ea41be969629eecf4da74b8946f6f220832b06cf69193f362b5002841079a862
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external websites, some of which are hosted on disposable domains and appear to be part of a link farm. The PDF_URI heuristic and the high number of URLs suggest the primary function is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=steps+of+photosynthesis+ap+bio PDF link annotation
    • https://ottopianos.nl/files/diredoxenujotuga.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/4235163499.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/jatulofigedugatifuzi.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/32636047092.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/14863572133.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/71901895447.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/48585402638.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/begufa.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/jobilibivunu.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/vufexapoduladelo.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/64819273386.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/xobako.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/40938538439.pdfIn PDF document text
    • https://electroagro.es/pub/files/kujuwiwimuzinuguvutuju.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7433284225efe9ea3ea3baf8190eee77/67705430281.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/labesekapajezebowon.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c673929534a3b150a9a8461318e195cf/varosunufano.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/49581811820.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/gukusilijim.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/22451036190.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/86605959549.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/44343219664.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16147f689a1e86---15809751865.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/80840462598.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_off0000bf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF56 16288 bytes
SHA-256: d4c5ac037fe6f422a3ebc2e4eab13dfa8812982fb21e3e0f102e295819c43a29
font_01_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 10636 bytes
SHA-256: 16ca5f825be8d2f53f621208c6fa2f87e27785a33e90a3c183699dc26fc72140