Malicious PDF — malware analysis report

Static analysis result for SHA-256 be59575aa1235acb…

MALICIOUS

PDF

86.9 KB Created: 2021-09-19 01:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7c0accc6b1b188a311f9876426bdc6f SHA-1: 135f85e04dcea6151847c3d5b00be9ddcdf9fe9a SHA-256: be59575aa1235acbc918b39a48aff37a1b6834e7073a2c632acd365cf6ad4bbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the PDF is likely used to redirect users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://archism.ru/uplcv?utm_term=new+hack+ml+free+skin PDF link annotation
    • http://scea.edu.mn/ckfinder/userfiles/files/kovex.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/gusalavarasevam.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/fudemuwonogokozodasojal.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5edc0851f4775a18e9ec2aafefea8676/jowaseranevofok.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/57988424329.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/84865889103.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109131805195331.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/12634151900.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/gizule.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/33429315096.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/xofajijedipanaxasumefi.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/75329277631.pdfIn PDF document text
    • http://glassick.com/userfiles/file/68809792432.pdfIn PDF document text
    • http://falerisztika.hu/tmp/59424188925.pdfIn PDF document text
    • http://humanlitech.com/files/files/20253585002.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/47074399206.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/8013267156.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/jimawolugigujebav.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/54951848996.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/8053245364.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/tadoludipunulawaja.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/36360478449.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0c1cd9684cbea083547b7d5ad094890d/92821745736.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/16863149349.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xozusir.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/tofimeju.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD736 16984 bytes
SHA-256: 2f0316de1dbba6d22d30b80babbf5f460ae1d47e6af7e66fa925bbfd6b78c447
font_01_sfnt_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 10540 bytes
SHA-256: 16e96b27f679d7031dd2ac6966a336b2916aaae87f6a18de2aefd01def2af956
font_02_sfnt_off00011a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 17764 bytes
SHA-256: d7d5555757459761ce22946eecf9a66e0541067581867da0422ff259af1e5242
font_03_sfnt_off00013560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1