Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc803470a46c1150…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 05:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c980c6519ff77c89f9a8499ee850aef0 SHA-1: 40b059af966007fdd1c44d89be09682af42c9d9f SHA-256: cc803470a46c1150eacccb208565ecc73e7f4f000d4a6552399c978c4cddf211
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to obscure the true malicious destination. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document intended to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://yameitecl.com/ckfinder/userfiles/files/20210916_235304.pdf In PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/nesamigitubuxaw.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/46877704643.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rukabupixogusavujerala.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/14093385295.pdfIn PDF document text
    • http://castel.lu/userfiles/files/77082494607.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a5irp65vb943au8usir8mb4515/42292686012.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/dosorizetusepasolu.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/lezusulujagadogut.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/28277902043.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/33126125508.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210907020529.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/25688727491.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/xijagiragirozunulesireku.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/80000363848.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/64558287211.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/seridajudepi.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/mebuzabapekaguze.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/vapotifokoxopud.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/menovufexujiwabomegobewi.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/70722952182.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/78683887777.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/34faaafe6d38c65f3c822798c3b2ac78/1448279754.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/nusewixizexigab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sing+play+karaoke+your+mp3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000e639.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE639 17428 bytes
SHA-256: d4dd81d81d8479fb3b4211e74b95b3502b4f896604f692a22065740b82387f5b
font_00_sfnt_off0000b500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 10880 bytes
SHA-256: 654e898d33236803615e3b1d4faf6800193dbcb466355ac673e822ca7fcc575f
font_03_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 14624 bytes
SHA-256: 67b974eeeb6d2a53d1c8e69f420e65c789e2913e307db8ead0fcab34267947b8