Malicious PDF — malware analysis report

Static analysis result for SHA-256 816f610efeb9355f…

MALICIOUS

PDF

96.2 KB Created: 2021-10-11 00:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2477849b5a36ca88a93316b372a7c9c2 SHA-1: b1e7bd44d261a5c3c28cc3a54135a350991444e2 SHA-256: 816f610efeb9355f5bbf4c64469910c9edfab8c99b08a7dbbe997cef1fb43205
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://angkagenap.com/contents/files/72842714836.pdf In PDF document text
    • http://divapharma.com/uploaded/file/83130698949.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/fibow.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/10069729141.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/morowiloga.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/tewukizazoti.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/lovob.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/kaduse.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/gokopamuxivem.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/12154718158.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613581119288b---zirilubutiraz.pdfIn PDF document text
    • https://obrbikes.com/files/files/jazuzewigajanav.pdfIn PDF document text
    • https://msiutilities.net/documents/36761453017.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/1211543364.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/setotexudoxeguzi.pdfIn PDF document text
    • http://esistore.de/userfiles/file/67708141337.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/faxokol.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/remixuwevafa.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/mogelulanufikulomafataf.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614cc6dfbe9af---71648338633.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/72853946512.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/cf8a43b6a666dca686db216e97e1880a/gurujizasudejav.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/10055164675.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/lusixejuzasev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=red+crown+woodpeckerPDF 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_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 19936 bytes
SHA-256: b635f37dbbadc72a92e5c071c91b9461752063f17cf3938f4d24fcbe8c54d66d
font_01_sfnt_off0001440d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440D 10164 bytes
SHA-256: 2a8eb251912714f8ed9821301c2ffc2cb956e539c3ad339869830fd7b2482b52
font_02_sfnt_off00015ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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