Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadae9ea6abf8e0e…

MALICIOUS

PDF

73.1 KB Created: 2021-04-23 12:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a09e0621f350549c727d58500440ece3 SHA-1: 8bbbf568b6645aa061c4ae97a35c9339a444ea19 SHA-256: aadae9ea6abf8e0e29f7a055034e112169b81bb9b44349a7f85f0221fcad020d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=computer+systems+manager+jobs
    • https://cdn.sqhk.co/manowipete/jcgeTia/absorption_spectra_of_photosynthetic_pigments.pdf
    • https://cdn-cms.f-static.net/uploads/4485457/normal_6057c71bdfc5b.pdf
    • https://cdn.sqhk.co/vujagefamig/9qihhjY/zomelozuvogo.pdf
    • https://cdn-cms.f-static.net/uploads/4423454/normal_6030ed493a413.pdf
    • https://cdn.sqhk.co/baxoladipezu/fiinjd2/23032764015.pdf
    • https://cdn.sqhk.co/bulelovuroga/eCZijic/french_gel_nail_art_ideas.pdf
    • http://profaudit32.ru/what_is_the_importance_of_plants_and_trees_in_indian_culturect901.pdf
    • http://how2clever.com/91682760067opo2.pdf
    • https://static.s123-cdn-static.com/uploads/4470028/normal_5fcc5a3c6c968.pdf
    • https://cdn-cms.f-static.net/uploads/4392647/normal_604ed155282a9.pdf
    • http://sadovik.me/information_security_risk_assessment_checklist63k58.pdf
    • http://fabermanufacture.ru/27087271722v1nwa.pdf
    • https://static.s123-cdn-static.com/uploads/4374857/normal_5ff2140170379.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0a9d52b7-bae8-445b-b6d2-8eba0f02533c.filesusr.com/ugd/729231_63a9362425d144f6b61f3d083d7a06cd.pdf?index=true
    • https://s3.amazonaws.com/pokorevalaxex/love_warrior_book_review.pdf
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_816ec686b088494bbba4ddf980b682e1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ad600fb8-090b-488b-ad19-6337a7f84058/pavekilak.pdf
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_980d522231c94082bdd3e139584daabb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3f5150f4-7922-4b32-b17b-75a238a35074/feken.pdf
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_0669b18f202d43648dfba76f0697c8ec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d38454a2-d303-4a0c-b7ed-9e2682b0dcd3/37012168262.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_b79e519b2fd54c1a8789ed362fca1411.pdf?index=true
    • https://s3.amazonaws.com/jirebonudur/zusovevulukosewebelomexa.pdf
    • https://uploads.strikinglycdn.com/files/a10ceaa8-4fb0-412f-8ea0-42b607202ee0/zuniriwerob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16c.bin
12b217412c440d93195b11d0b215ce0e1e10341fdb1197094b0ce1bcbb45e3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 5332 bytes
font_01_sfnt_off0000f379.bin
4f8a6c0f7b450a4f7c6e211c86ff43e0142de6cfe2750afeff1b7cd2ee64be1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 10332 bytes

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