Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a486a1bdc3af53…

MALICIOUS

PDF

75.4 KB Created: 2021-03-10 00:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 1fe5a0db1ed84426590de6c1cf563b04 SHA-1: 0e3d0278ccaef628db308277e6b98d1d85bbb153 SHA-256: 88a486a1bdc3af5348a5b2919b0ed8f6dd2fa02407074a61661c0e9862f339a2
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with the primary one being 'https://ponafet.ru/wix?keyword=power+bi+resume+points', suggesting a phishing or malware distribution lure. The PDF structure and embedded links indicate it's part of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=power+bi+resume+points PDF link annotation
    • http://evakuator-uga.ru/norton_anthology_of_theory_and_critieqn49.pdfIn PDF document text
    • http://pewujok.mypressonline.com/rumegekemogavevagerazudik.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/how_many_sentences_is_a_brief_paragraph.pdfIn PDF document text
    • http://fragcups.com/sixepaxozuxisirfl2s9.pdfIn PDF document text
    • http://evromotors.net/what_does_positive_psychology_mean68nos.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/40918642655.pdfIn PDF document text
    • https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/6375e1640a4.pdfIn PDF document text
    • http://mp4.design/nufogoniwawonomaxu96hx5.pdfIn PDF document text
    • http://bitcoins-profits.com/bejusumuw9xgw.pdfIn PDF document text
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/suzejud_vudepaxadeda_ronamogubejodiw.pdfIn PDF document text
    • http://jukavoluv.iblogger.org/358028916.pdfIn PDF document text
    • http://mekatososa.iblogger.org/chithari_therikkunna_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rekipefivikupa.rf.gd/jurnal_akuntansi_keuangan_syariah.pdfIn PDF document text
    • http://jebanodubefa.rf.gd/botofipin.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/united_airlines_flight_attendant_career_information.pdfIn PDF document text
    • http://bojibag.epizy.com/fiwavut.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/gawujojazej.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/namowo.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/wujigujuvaxujesixapeguliz.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/fekebaguloletu.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_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 4956 bytes
SHA-256: c302c9e07a2c5fc19192e004001daf6a52e28199cde63d0c1e29adecac20e290
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 11408 bytes
SHA-256: 14bf20a0e61895265b579bff70b26fdfee7106c476ce368e9de1cbc601914f61

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