Malicious PDF — malware analysis report

Static analysis result for SHA-256 9444e4db1c45ef97…

MALICIOUS

PDF

73.8 KB Created: 2021-03-24 22:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 10218b68a2e0f16da9e641d8bfe314d4 SHA-1: 1b2d558602a328dd7cb5e82c0a04a944a624ae67 SHA-256: 9444e4db1c45ef971a5a27396a3726b5f36618e2f723d007c5e3536b15c8d51e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing campaign. One URL, https://xajibur.ru/wix?keyword=evolution+natural+selection+worksheet+exercise+1, is particularly suspicious and likely serves as a lure or redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/wix?keyword=evolution+natural+selection+worksheet+exercise+1 PDF link annotation
    • http://bogplaktnc.fun/shell_scripting_tutorial_point_for_beginnerskjfc3.pdfIn PDF document text
    • http://bozidik.22web.org/soduzaremanigez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369343/normal_5fcd1b4960c80.pdfIn PDF document text
    • http://pulemovidake.22web.org/loxavozibabikufusuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391315/normal_5febe92c31b1c.pdfIn PDF document text
    • http://onlyforyou.space/38731887092kd8qv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_6013b12011a2e.pdfIn PDF document text
    • http://wide-mean.top/600765271664r1pb.pdfIn PDF document text
    • http://creamwalls.online/16660116827udd9g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_155dade1645843c58c89af163f24893c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a791b231-e55a-4bf3-aec7-cb798d88cfb7/pisaziwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a8038c-2a3d-4fc4-bf10-b9c98d186dca/dofovesifok.pdfIn PDF document text
    • http://tusajemepo.epizy.com/zoxolebeduwodoni.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_69dc3ffe223c40f5be87748fd4869b3f.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_28a644e9304d425b8d7eb4aa79ad7c94.pdf?index=trueIn PDF document text
    • http://mewazeni.epizy.com/bahubali_movie_naa_songs_com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c01e95-6cbe-45fa-9e0d-f2145ecb7d5c/how_electronic_stability_control_esc_works.pdfIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_c3bf624e4414402884591fd21bcc1f4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d8ca45-cc8e-4be3-b6e5-52aac3140d53/dosozaxubife.pdfIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_334b3d38d9234f4099e29d5797e71c43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc1c008-0dfb-4d3e-a797-23461e27e1f9/59373007499.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_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 5180 bytes
SHA-256: 17741815b05c75bd63c5f8a48e78915042240fd042fefbcf8120193ca02e40da
font_01_sfnt_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 10432 bytes
SHA-256: 270c8f9eef941f8b510bb3339292ab833fed8dced2ca33693415ce2a9a3506c9

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