Malicious PDF — malware analysis report

Static analysis result for SHA-256 f690ff4173abeec4…

MALICIOUS

PDF

72.1 KB Created: 2020-12-25 20:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d3a95219b426f22afa5667fc22206a7a SHA-1: dbd32c0359be5debda5e014bef1f74c29f870057 SHA-256: f690ff4173abeec42a502ba0b47722d6a87af6cd279e8dd8a253a20afb272b60
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 0.9997

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://trafffi.ru/123?utm_term=mutilate+a+doll+2+oyun+skor PDF link annotation
    • https://naxosunibeg.weebly.com/uploads/1/3/4/6/134676516/fosebewilok.pdfIn PDF document text
    • https://cdn.sqhk.co/dasupejej/hjiggFR/fezofasexovugoz.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279037.pdfIn PDF document text
    • https://vibakifekapob.weebly.com/uploads/1/3/1/3/131398015/607e2f3d06696.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/xemobubax.pdfIn PDF document text
    • https://zumutunamoja.weebly.com/uploads/1/3/4/5/134588160/rudatiripipigukugid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1358a166-32aa-4fc4-9bbf-7845eecdf30b/53910200599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd748daf-d02e-450c-860d-54f4fecf5091/93010075366.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/manganese_heptoxide_uses.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/14_and_under_1973_movie_watch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e5a834-1135-42e8-86f8-032119ca12fa/5_year_financial_plan_template_perso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5dbd74a-95c9-4ed8-8c0d-a58f82e7a46d/the_room_original_script.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/how_to_mount_a_samsung_32_inch_tv_on_the_wall.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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 5124 bytes
SHA-256: cb63c06c115e2bbacc448648af4c2357507e9a532d52c63f51d2e0eb21ed6069
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 11984 bytes
SHA-256: 92aeff3f1af1a71bcd5dda2581c151f41f138eb2048bcd8dac477bec53beea98

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