Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9169bf4cd7d28a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-24 02:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22a37f7cf2cf7d6734c4e111c9820ae7 SHA-1: b1560c6cbe52c0bc195e3602288f1909882db08c SHA-256: 8b9169bf4cd7d28a0d611c1ad5744a602cdd9b1bc1619bbe0851b783180ce890
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick the user into downloading and decrypting a payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • 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 http://itps-group.com/uploadfiles/file/lixijajenelalasugibatalu.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/hrrrjqhqa32pcrdpuskbb7q3kt/lelusogox.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/33284077976.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/xekafexapomij.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/1917828447.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///bebegirumiparabufuzixus.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0a8a21793---tetepomuvi.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/60869194635.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/74556919562.pdfIn PDF document text
    • http://afslab.asia/upload/files/37303151910.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/xoratutejapazanidegari.pdfIn PDF document text
    • http://geose.ru/userfiles/file/38439723073.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210914_4B5E2A5644C61D05.pdfIn PDF document text
    • https://o-dance.com/upload/files/kodudixowenox.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/kekijosogikigejatorupewa.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/5437289251.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/ruvix.pdfIn PDF document text
    • http://laduses.nl/image/file/pesugurifal.pdfIn PDF document text
    • http://sial.pl/galeria/file/wazidovavajozidozavugef.pdfIn PDF document text
    • http://dsfly.com/uploads/files/japovozuwetanejavubo.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/96047287160.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/binixujilejedolobar.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/28701398236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+into+an+android+phone+without+pinPDF 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_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 10636 bytes
SHA-256: a9b30477dcfc6517024e9ca6f4b29c4e89e967a343b028cae3a9aef590a1d767
font_01_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 17380 bytes
SHA-256: 86b2faf26053d7e39fc193baba28e169332face8712b1016937ec2a883166483

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