Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dd7fd2ce9569cb…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 13:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54a6f3605ee9cbeae79d3f87c3b26d73 SHA-1: 3d1d8c07a9d89f5435aa89dd0625592b7cfd11b8 SHA-256: 77dd7fd2ce9569cb553c8fd2a9505887453736f19134f2777a33b20022267d70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chrmglobal.com/userfiles/file/gujitamewadinuvejuwubega.pdf In PDF document text
    • http://wellgroup.cz/UserFiles/File/42022786337.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/vulewaralesoperopofu.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/58879759443.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/7748591661.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/95803885337.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/36296351757.pdfIn PDF document text
    • https://kratky.eu/files/file/vamopix.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/aba0acc0132104fbfa01145d6a400bcd/54368778252.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/tamelodijawodaxabavifi.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/gilije.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/23477727193.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///xolalubibugo.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/binobaraxud.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/56705763705.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/lojewikijawufebiguwar.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/lofosor.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/44241871354.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/de2859bb949964ef9bf2dc8367ef6724/geririliwugavex.pdfIn PDF document text
    • http://packamate.com/userfiles/9021347840.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/nipebajefevuvigamezadoda.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/51002243437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hd+streamz+latest+updatePDF 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_off0000c0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CD 17048 bytes
SHA-256: 465d8a9a34ca3b702fa1d12da586d29a214a91ec0e74099036190988d694e8f4
font_01_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 10388 bytes
SHA-256: d741de3670f3d08c3af83dca22c6443d9116b6b587fe6f48f9798e68db52c8b2

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