Malicious PDF — malware analysis report

Static analysis result for SHA-256 5623935d3e90a63e…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 15:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01d43b3e64320adeeec343752254df11 SHA-1: 16c5a02bdbe8cf2b68c9a4bdee09128fbd6a95bd SHA-256: 5623935d3e90a63e155b3a002a7bdd3d499249cf67b96c76a29679574732c29c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, with one specifically identified as a random URL pointing to a suspicious PDF file. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://horacebatten.com/ckfinder/userfiles/files/21471592189.pdf In PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f5cea7a6fbf7e5155e64c0281df81881/79869407060.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/49570019579.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210914061659.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/41234499940.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/mizexojegevipez.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/73348995121.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/72425085196.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/forisizurakegut.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/gegodazepokol.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/fugajo.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/9824781531.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/pubobijokov.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/2936566289.pdfIn PDF document text
    • https://tivicom.vn/upload/files/tojor.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/75543523922.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/luwugamusalenugiwizew.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/58909092886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=staad+pro+design+example+for+complete+buildingPDF 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_off0000a914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA914 15660 bytes
SHA-256: 159cf27a1b5dfcc69b5b31c256e1df2bfb47e3d760e8f086f75fc8dc418fc351
font_01_sfnt_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 11380 bytes
SHA-256: eec4853c90d6e867f2e25437c2d9e69fd316aa402249870b5bf031f609a35bb9
font_02_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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