Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11a9d66c3466706…

MALICIOUS

PDF

97.1 KB Created: 2021-03-14 03:47:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4f5492fc8e7bbca12b80a37d1c881e3e SHA-1: 7cf6d476fa8d8e604f2b70e3bc2c9712e96c46db SHA-256: d11a9d66c346670643258550ab09a0096172a4cff6d92cc2e4c126650e297fc5
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a suspicious domain, identified as a phishing or malicious resource by ClamAV and ML classifiers. The document body, though heavily obfuscated, appears to be a lure related to downloading a PDF, which aligns with a phishing attack pattern. The presence of external URIs and the overall detection by security tools strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=astm+a325+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446390/normal_5fd9e8e6e7833.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495849/normal_5fe3f90cb3623.pdfIn PDF document text
    • http://dsv-trening.ru/the_shape_of_things_book_neil_labuteu27i8.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/folidumem.pdfIn PDF document text
    • http://clientbluebadge.com/betiwarumowwrurc.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/proof_of_taylors_theorem_with_integral_remainder.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/what_are_life_liberty_and_property.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5fd79003a610a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_603cf69e4cd1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d306cbb8-6f98-4a20-be51-317fe754589a/different_types_of_knots_and_their_uses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da7eddd0-46d5-4452-8bff-78750c9bdd87/13707728917.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/21265420726.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/24415563117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e8d634-880c-428a-a765-4716bc31f638/2007_toyota_yaris_sedan_yrs_for_sale_new_jersey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9226816c-3487-4cd2-904c-7d028dd8c67e/what_is_private_international_law_and_public_international_law.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/wefavagixanuliwotefota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3193c4e1-ce9a-457b-bfe8-d32bf3b9f5a8/32042096473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c1c7c2-e3b6-49ac-b4b3-62e1469eb4ac/jazitas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b72db6fb-91e0-425d-8bcf-feddd92b8231/what_is_the_tsa_311_rule.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/biology_notes_for_class_11_chapter_2.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/ASTM_A325In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD6 5592 bytes
SHA-256: 8d1fa058c36b2ec2d3fefb6d8a8724e1800a84eb7eac0e20a2c90efd48ec7ccc
font_01_sfnt_off00014de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE6 12308 bytes
SHA-256: e2592cba9771a50dbdcce4a70102e8cecc8e2af7e56f696edeefecbf886afbd8

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