Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a4d3331b3ba65e…

MALICIOUS

PDF

72.5 KB Created: 2021-03-30 15:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 238847ea45c59cb122e884ffd6ea1818 SHA-1: d8c3b2bae8fab53a2bd3d3ee0cad243a41e9ed6d SHA-256: 19a4d3331b3ba65e70209fa1d73bd883e926adb9f19a26544bc5e048599e2f8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF file contains numerous external links, with one pointing to a suspicious URL that appears to be part of a link farm designed to improve search engine rankings for malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=family+law+practice+manual+oklahoma
    • http://votutatiturapat.22web.org/garasowosu.pdf
    • http://falisekivi.iblogger.org/garrett_ace_350_owners_manual.pdf
    • http://jukekelexoseda.22web.org/xugotororenupigajeg.pdf
    • https://cdn.sqhk.co/puzukebejas/1ujfLDE/drive_download_quota_exceeded_for_this_file.pdf
    • http://wizagulonas.22web.org/96552523823.pdf
    • https://cdn.sqhk.co/vavusiwi/jbjhhb5/my_lips_hurt_real_bad_quote.pdf
    • https://cdn.sqhk.co/nixibaraje/jr1iRgg/84118842668.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gatazeromij/riloxelexuzedobuk.pdf
    • https://s3.amazonaws.com/wazotojemov/33789234111.pdf
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_3b3d0786cd44468693c92c4603792a14.pdf?index=true
    • https://s3.amazonaws.com/fupanabivote/gifofaxab.pdf
    • http://vuwozefadila.rf.gd/17923052623.pdf
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_0750e67b548c4e91bc0b0603d5617c3a.pdf?index=true
    • http://gasigigi.rf.gd/brazil_economic_history.pdf
    • https://s3.amazonaws.com/xeruxaxer/84057376800.pdf
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_96e1d4552c9f4fde9038e3fbfa7dc376.pdf?index=true
    • http://gisipusizen.rf.gd/av_comparatives_android_2018.pdf
    • https://s3.amazonaws.com/kibavutibeved/27821057805.pdf
    • https://s3.amazonaws.com/tejuvonixag/52077317664.pdf
    • http://xapimiwosusuv.epizy.com/sig_sauer_p238_pocket_holster.pdf
    • https://s3.amazonaws.com/luxelula/how_to_be_a_pimp_101.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda0.bin
d94e1da34b6e6211eb783ee55dfc3168349bfad0027f0f4498a3cb9451828ff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 5208 bytes
font_01_sfnt_off0000ef48.bin
b7d556de318ba1f302929507942dd7651dec94011dd4372c28fe9cccaf8afe69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 11152 bytes

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