Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc648aa8d9e6480f…

MALICIOUS

PDF

84.1 KB Created: 2021-04-07 13:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 74b59ac11008448fe627298d2c114baf SHA-1: 6cc89807e006db0cc642562b5f58de7d50331aef SHA-256: bc648aa8d9e6480fbaba30adfd8df678e9781eb65529842901c33d529c1ba6bd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially malicious websites, possibly for SEO spam or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/wix?keyword=introduction+to+atoms+worksheet+quizlet PDF link annotation
    • http://albl.ru/vezixedizipilenunomonot60y2z.pdfIn PDF document text
    • http://onlinetyz.xyz/onn_universal_remote_codes_for_sony_blu_ray_playerl3jkq.pdfIn PDF document text
    • https://neboxikadifi.weebly.com/uploads/1/3/4/5/134588308/00e44ee75b48.pdfIn PDF document text
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/3060434.pdfIn PDF document text
    • https://masizomomom.weebly.com/uploads/1/3/2/6/132681315/5583034.pdfIn PDF document text
    • https://rosowimibezot.weebly.com/uploads/1/3/5/3/135392622/8122139.pdfIn PDF document text
    • https://sulipebi.weebly.com/uploads/1/3/0/7/130739254/talazonixekuwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sewamos/toyota_hilux_head_unit_wiring_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/tejijepadulif.pdfIn PDF document text
    • http://korotegimokuv.epizy.com/have_a_new_kid_by_friday_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/opening_blend_s_bon_appetit.pdfIn PDF document text
    • http://kenugaderagof.epizy.com/ansible_copy_template_overwrite.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/35282558721.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/bavapulu.pdfIn PDF document text
    • http://zaxitow.epizy.com/jidozulo.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/3d_geometric_shapes.pdfIn PDF document text
    • http://xarigezosuwa.rf.gd/lofalezesisuvuxiredurun.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/gifujolobaxirugagasar.pdfIn PDF document text
    • http://rotitow.rf.gd/animal_kingdom_map.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/74821258521.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/best_stories_to_read_to_baby_in_womb.pdfIn PDF document text
    • http://rifezovepon.rf.gd/copd_stages_gold_guidelines.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 5448 bytes
SHA-256: 696a74c1c7de59f3a0dcc202a7fb83c8e579b8d13773158458d9db378570203b
font_01_sfnt_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 10640 bytes
SHA-256: cbeedde01da7200a5165a05787a2e9b56b12659feefd9b43e25f9e4c2016b73d

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