Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3acaaf7e88bf62a…

MALICIOUS

PDF

72.0 KB Created: 2021-06-06 16:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5aca085c3f6c0676257ffb17bee2325a SHA-1: 11d73660f9f70dd40db9233fc1db9ad7ca70a30a SHA-256: d3acaaf7e88bf62a31428c9ff7d052f683751144a01f3acb772d2c44198e61a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/pbw?utm_term=how+to+write+a+discussion+for+a+science+report+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476294/normal_6059dab0481bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_60b8dc5000627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417037/normal_5fcaa8a5d1630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_6021722bc7d99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481993/normal_6041298d1517d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_6067695ca81be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_6021fb3a2081f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_602222aac550c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sovafiben.pbworks.com/w/file/fetch/144539172/2009_mathcounts_state_sprint_round.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537df9bc-5ee0-4d91-8050-111b12d5e1e1/prefix_and_suffix_worksheets_with_answers_grade_6.pdfIn PDF document text
    • http://ronefete.pbworks.com/w/file/fetch/144504270/bell_hooks_from_margin_to_center_summary.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/f/aaro_nenjil_mp3_song_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c56f957-008c-463e-8f86-5aefbf2868ad/preposition_exercises_for_class_3_cbse.pdfIn PDF document text
    • http://silasofinat.pbworks.com/f/59911385654.pdfIn PDF document text
    • http://gitixofipoxu.pbworks.com/w/file/fetch/144539199/nurebujetavarajidibup.pdfIn PDF document text
    • http://tevimunon.pbworks.com/f/timex_wr30m_gps_watch_manual.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/kosafira.pdfIn PDF document text
    • http://nudifimixonu.pbworks.com/f/lulivajuritonadalagelanij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5926e0-752f-4779-8785-e257e48e14b0/xawuzisakoxirem.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_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 5420 bytes
SHA-256: abb0c3682514486e1eaf35f82aa0ee12f8e680d3490fdc4239baeb37d074570c
font_01_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 9884 bytes
SHA-256: 597eab1321881f7998dc256e0f6ca4bfa37e484826a4d4e799c9c2d4baf3c838

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