Malicious PDF — malware analysis report

Static analysis result for SHA-256 397b24e6b7b92ce3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 00:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f33ab3fe656acf61ce4b18f23ade9e08 SHA-1: a79d44f29e65d86411a7b778cdaa7f8870b60197 SHA-256: 397b24e6b7b92ce3b5af66641e2a995dd97acf954b53054644c6419d7cf4af6b
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous distinct hosts, suggesting a phishing or malware distribution attempt. The embedded URLs, despite some being marked benign, point towards a pattern of directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--m1age8bh.xn--p1ai/files/file/64776638930.pdf In PDF document text
    • https://botroul.be/uploads/16692289097.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/41140299919.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/5815564143.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/92046465260.pdfIn PDF document text
    • http://epicridesnepal.com/files/79051182487.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/linipafakebaziwi.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/23659117752.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/46912304940.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/kipubaxetapixafiwilapig.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/pelekedix.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/rupopogerosil.pdfIn PDF document text
    • http://aprt1day.ru/file/46209291937.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/duriwufejevuloromesi.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/89384584599.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/jewaridorotadewed.pdfIn PDF document text
    • http://snsi.jp/image/news_file/49465152630.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/womaperilajozimototadakos.pdfIn PDF document text
    • http://metapolar.hu/tmp/babej.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/75057358817.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613f84fe41e39---tafizuwojawafemoleti.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/43799604468.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/26314876992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=art+set+app+androidPDF 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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 17452 bytes
SHA-256: 6f385f4574e88f91a73c7a6fb10e5b5c8dec1ccea6292ee910d8cf55de129d35
font_01_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001241e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 10320 bytes
SHA-256: 463bc1b4546650b874592fbceb5acf75ae05c03704fc6dd9fe069d96e0cfcd9d

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