Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e47dc34eb01b57…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 16:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a3e080ac054b5474f441fa911cd6954 SHA-1: f34a30029715d7751aaa4c631dd4aca55541c8dd SHA-256: 79e47dc34eb01b57b7e9106cac4bbea092abc8e7e22e51a9b18d9fcb4e31a524
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137fca3483bf---6683437037.pdf In PDF document text
    • https://rireenfrance.com/images/upload/files/93503393766.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/58683722089.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2b476d76b---zobekevege.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/46095404248.pdfIn PDF document text
    • https://gulamanis.com/contents/files/39562040482.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631033270.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/22512533002.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/towud.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/fifejopeminabirupod.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/43296899642.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/5031569067.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/jifubuged.pdfIn PDF document text
    • https://actor-conseil.com/files/file/29301204865.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/77392781613.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/68449172447.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/30866473712.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109050244588586.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/39308655572.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109011648433390.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/fodovazudoniterasevow.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/14929624280.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/tiwozilev.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210907203704.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/rojoxabinifesazitab.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/41405522513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=secret+video+recorder+pro+3.1+7+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_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 10764 bytes
SHA-256: eb009203914199c1c594acde06f261e2c0fa35e9e7559155d6fd3e9386d5e854
font_02_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 17604 bytes
SHA-256: be5fa6c2ea5e137a6dedcedc53025793e716db1cbc9a68978ed79237dc840266