Malicious PDF — malware analysis report

Static analysis result for SHA-256 66968ea2d29c6326…

MALICIOUS

PDF

73.3 KB Created: 2021-01-22 23:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ed9802d976ba1b8a207aaa7d37403bd5 SHA-1: 78524bc3532800e4de3a6f631108983d7a0f8d94 SHA-256: 66968ea2d29c6326a4ed983f981e79a90b7330389015a25b31a63b5b88cd5243
156 Risk Score

Malware Insights

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

This PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to other sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

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 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://druttle.ru/123?utm_term=systems+by+substitution+worksheet PDF link annotation
    • https://vosuzujil.weebly.com/uploads/1/3/2/6/132681517/tezerozuwipu_gotezopa_newob_tivutozawunoko.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/412892.pdfIn PDF document text
    • https://cdn.sqhk.co/jovojatubo/MhgcPge/69446450977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412387/normal_6000d960f2b76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vefagukolile.epizy.com/60_fwy_east_traffic_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/interrogative_pronouns_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/jurunevirisodirivinezak.pdfIn PDF document text
    • http://tolimimagag.epizy.com/zafusisaxaveg.pdfIn PDF document text
    • http://levuvov.epizy.com/dekixefefexodevije.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/bollywood_whatsapp_status_song_video.pdfIn PDF document text
    • http://bovinow.epizy.com/hypertension_diagnosis_guidelines_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/ramadan_calendar_2018_karachi_free.pdfIn PDF document text
    • http://pazipinabobon.epizy.com/football_manager_touch_2020_android.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_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 5184 bytes
SHA-256: fd43e985bbe6790891f1164a32062dbf75c0f8e65a4d80c36ea6ffe694b7758c
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 10760 bytes
SHA-256: 11d01aeddde0cb79ce12cbab9519adab99ccbdfe3ea80e45b08821523025951e

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