Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf5e98c91a5f7e1…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 19:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec4011e653d634101c8ab9bce3dc7567 SHA-1: 5cd78d1313442ee5feaa660998ab9dc3097df2bf SHA-256: aaf5e98c91a5f7e1b6fafe430451c0ba96f3bdfead8d627a4db0aed0aec21534
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including one that appears to be a download link for an Android application. The presence of many disposable links on potentially compromised or low-reputation domains suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=download+tap+tap+cn+for+android PDF link annotation
    • http://wsystem.sk/userfiles/files/kabunejimuwetep.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/rumokupamof.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109070915418646.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/55729293891.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/75093611688.pdfIn PDF document text
    • http://zenpersonnel.com/UserFiles/file/98668463040.pdfIn PDF document text
    • http://ccadl.com/files/20210910234625.pdfIn PDF document text
    • https://synersys.fr/contenu/file/68569928548.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/74263187834.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/84684362112.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/gixabawejo.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/51796815816.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/17302307329.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/bezofoxukuw.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/sovopuwimilisalagivawu.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109180754595967.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/ziriseful.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/10332941252.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/mikun.pdfIn PDF document text
    • https://accessnepal.org/userfiles/file/mumapo.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/41858549609.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/pulejinigemen.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_off0000b021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB021 10400 bytes
SHA-256: 1021dca959cb268902823796d567f78f848e358f451ca6127409cb4053855f33
font_01_sfnt_off0000c7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C9 17632 bytes
SHA-256: 0a878f5af3966a4e8223471e4e3a2ed01452df2efe6b2d7e02f4ece7bfa83d10
font_02_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.