Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c02401ecbc839b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 06:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b864876abae4abf7e257d72226b2df2 SHA-1: 5c24204f8e4848fa6c556f50b837bf698ecf5845 SHA-256: b3c02401ecbc839b028f58ae7d1b38e6a03338c26813ddd1aa8e6c5a5786bb4c
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs pointing to various PDF files, indicating a link farm or distribution mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically suggests a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bestcoloringpages.com/userfiles/file/49436795502.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413e576cde0---sojijos.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/84992608001.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/wolilujujebesijer.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/sojapifenuvufevosatoxid.pdfIn PDF document text
    • http://soc-in.com/data/media/files/37617758035.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/1808739894.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/82763565255.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/44400613902.pdfIn PDF document text
    • http://santabruna.cl/upload/file/71643243292.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/49416799408.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/96483217565.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/ludegifigetakote.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/61751568702.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/mezatovepafeno.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/55016798829.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/tudilurorurozu.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/jalomutimoveli.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/rusuvuxewesil.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/82856681428.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/vojalakuxokavebuvo.pdfIn PDF document text
    • http://meta-min.com/files/fikepivajizawusev.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/29802761622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+screen+record+on+poco+x3PDF 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_off0000cec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 10556 bytes
SHA-256: dcaabc2d1ba6b61e06fa31f99174f062d5d33d48c006dd68e36339ba1006efe7
font_02_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 18780 bytes
SHA-256: 1234f4fa7ba5160ed90e8d49ec91af940cb061ed596a255b0a80affae8e880c5