Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5e80578e782938…

MALICIOUS

PDF

83.7 KB Created: 2021-10-07 04:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a49dd1ef1495f6b42cc958bd7ce640cb SHA-1: 35ede67ebfcf346ec734201311d9391c862d7114 SHA-256: 7b5e80578e7829386a2b57882cbd835f915066aa0c341c828b77f1338bf0a577
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, and heuristic analysis indicates it functions as a link farm on disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further confirm its malicious nature. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=may+god+bless+all+of+us PDF link annotation
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/74570238457.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/63827668772.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/8027236507.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/xoporefedoravemisojaj.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/19988278505.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/lizavuwejejufagajigakimad.pdfIn PDF document text
    • http://nova-auto.com/upload/jedikolasutoterupegegero.pdfIn PDF document text
    • https://plasy.com/uploads/file/wokojove.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/55421827142.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/9931125661.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/17907917328.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/69856041687.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/10250312912.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/3642606903.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd8ed21ec---galolejefiworovelum.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/mebujuremidek.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/72848664556.pdfIn PDF document text
    • http://kasargod.net/uploads/file/8962273973.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/jodopuzome.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161319adba3441---5907921824.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/54967205957.pdfIn PDF document text
    • 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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 19964 bytes
SHA-256: 43d4c1f9416611324e33824658df5a045e1eb3571632dd4da2c5b798ce9e08bc
font_01_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 10484 bytes
SHA-256: e1a5ac46173e15581b814727721bf0a7bc196b125ff4b59f43200867f2cf4ba7
font_02_sfnt_off00012946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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