Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d0c69fe3ffd364…

MALICIOUS

PDF

72.8 KB Created: 2021-02-28 22:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d313c64a6b3be9d0e69316ba6533e332 SHA-1: bca813333947547fdde6d03b1682dd20dd5dc224 SHA-256: 84d0c69fe3ffd3644db848c959d1f3739a90ce2f6325b7d717ec29327432c3a9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various PDF files hosted on potentially disposable domains, suggesting a link farm or phishing operation. The presence of external URIs and the 'link farm' heuristic further support this, indicating the document's primary purpose is to redirect users to external, 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://druttle.ru/wix?keyword=gb+whatsapp+apk+download+latest+version+8.35 PDF link annotation
    • http://clubstore.info/90096294642hk2g6.pdfIn PDF document text
    • http://reduslim-ordina.site/how_do_you_flush_a_rinnai_water_heaterkruj4.pdfIn PDF document text
    • http://takipleskazan.org/88442674515pssbp.pdfIn PDF document text
    • http://callup.today/correct_form_of_verb_worksheets_with_answersucd1n.pdfIn PDF document text
    • http://onlineeshop24.xyz/mizigovubjdlli.pdfIn PDF document text
    • http://sayfelengs.space/lol_diagrams_chemistry_worksheetqrl3r.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/the_last_lecture_randy_pausch_video.pdfIn PDF document text
    • http://lovechat24.club/autocad_2013_full_tutorial820ww.pdfIn PDF document text
    • http://hookup681.site/wexefikinulifej9il1v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wajiletum.epizy.com/hampton-bay_uc7078tr_fan-hd_with_reverse_ceiling_fan_remote_control.pdfIn PDF document text
    • http://katetagozu.epizy.com/vasowoxisaxirapobenewuxi.pdfIn PDF document text
    • http://meluromotav.rf.gd/kebejidukudutepadox.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_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 5948 bytes
SHA-256: 882655ee7c5bc507f9694fd458cd5a57f8169766177c88083c4991de2aaccc78
font_01_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 10012 bytes
SHA-256: afb202ab1ec8664662a9dfb86e6b1aa1c4988f74d03179aa4ad7295bf786dbbe

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