Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01a102d31acf1c0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 09:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38c5f55af22499b296dfa09c59001418 SHA-1: 463ae585e5a36015e3637c3c647c444188d15b11 SHA-256: a01a102d31acf1c08c58b9bc51918ca745aa4d1c176ed56fa9fb9f1ea0a72660
126 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to potentially malicious PDF files on disposable or unknown domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document is designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://fusheng-vietnam.vn/admin/webroot/upload/image/files/nugap.pdf In PDF document text
    • http://duepassidalcentro.it/userfiles/files/javadonevimanemoposav.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6fe7dd0e339492d72bca96bb36f388c0/lopetasunuwodazako.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/tuvub.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/seburimafimowumu.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/tarogewe.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d05a02259b---38131230632.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/54228637357.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/61028432369.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/51131676612.pdfIn PDF document text
    • https://orangerun.re/photo/files/kerawigedipewu.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/10521501583.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/90787480563.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/fowozok.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/70456607822.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/sokutotuweguzaselapiro.pdfIn PDF document text
    • http://hotechike.com/files/files/77819345941.pdfIn PDF document text
    • http://orenprom.com/img/account/file/xopewarun.pdfIn PDF document text
    • http://upakuika.com/img/file/74283422495.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/xudipelepuvizezo.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/tapijasinirudawezaponekel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+previous+notificationsPDF 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_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 17664 bytes
SHA-256: 4d56c19e95819205626819f361843458e5992e774dfdb5870989710164dad498
font_01_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 10712 bytes
SHA-256: 6879cd8d3fe6cc444c1364a1d91fc1c7baeff0ecc7cd13d68da3d7c63e8a3dd6
font_02_sfnt_off000119eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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