Malicious PDF — malware analysis report

Static analysis result for SHA-256 61117fa6c6e08d1f…

MALICIOUS

PDF

67.9 KB Created: 2021-03-30 02:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1f265d95ce14407b0d8552120ef632b9 SHA-1: 5a7d50adffa356d596a9d95daf223507609b62f5 SHA-256: 61117fa6c6e08d1fcd8f88133100d763a53ed57cbedcd077c1803a8a822b1a27
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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.
  • 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://dafemum.ru/award?keyword=access+grade+6+pdf PDF link annotation
    • http://vuvajujuli.mygamesonline.org/garfield_comics_ebook_download.pdfIn PDF document text
    • http://tadefog.medianewsonline.com/varicela_en_el_adulto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_602e243f91296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417805/normal_5ff266dc53d18.pdfIn PDF document text
    • http://ginixotojaru.medianewsonline.com/90711679711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_600fdbedb2f77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_b8d64ecf80fe4d15bba26a6e37a7d47c.pdf?index=trueIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_e899c1bffad74fc6be4a6fa10a26c942.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/zipum.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_9ca14af5a43a4f709d7e8fe9768ef5af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/ambledown_gap_claim_form.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_3ac9759bf2d2460bbde3297c1a97283a.pdf?index=trueIn PDF document text
    • http://jazopizebe.atwebpages.com/zifujepomuxoraf.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_cdfc9351131344b697e3395d136b7e40.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_660d92fcfd7d47858030749022458df4.pdf?index=trueIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_0faebe76845d4f9ea71545508fb6d846.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB5 4876 bytes
SHA-256: 1fd2a3ca2688650af4e8f9ac73f12b5f26b25636ea7a5b067608f4ce47707300
font_01_sfnt_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 12244 bytes
SHA-256: 73bc9db498df1cc9ef2a3798fefd3c842e6f9ee27c5f8d39ba141dce37626151
font_02_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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