Malicious PDF — malware analysis report

Static analysis result for SHA-256 db538616cf931252…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 20:15:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: da09eb8cceb4af5e6da640765103ee5c SHA-1: 1b45f6cda6e34862d982451de58db6e93a2b39f8 SHA-256: db538616cf931252f7ebf14d1959ae4d996dbab0e6d03bb802e59a77c3f258c2
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://kuzutuzo.ru/wix?keyword=food+labelling+worksheet+ks2 PDF link annotation
    • http://xazamobi.66ghz.com/tasivasemisujozuw.pdfIn PDF document text
    • http://ziwixan.iblogger.org/66400689023.pdfIn PDF document text
    • http://fojogil.iblogger.org/tiwibufiwifovadukufupodof.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/cf943990-8e19-4a46-9292-6b2230be2704/82403929005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c634d358-b733-4e80-a628-b63f168c23d1/46751677544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1005f341-64b1-4b44-94d5-a085be43cbfc/68544180521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6ae328-0ff1-4c3b-b7d6-269bbe8a4a3c/gogavol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0f89ca-7d5f-492c-a2b8-84a39dc8caf7/5874646747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0965781-d662-41e8-9b9b-6b4e4f6734d2/curso_de_milagros_leccin_del_da_silvia_freire.pdfIn PDF document text
    • http://bosulug.epizy.com/95377795646.pdfIn PDF document text
    • http://xojesenokok.epizy.com/multiplayer_android_games_with_friends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bcfb139-b979-4a8b-8c34-c6053569c262/mawox.pdfIn PDF document text
    • http://lirepemewepe.rf.gd/1548116773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc0a1a8-6e78-4721-9ab2-8781a971432c/dewalt_shop_vac_manual.pdfIn PDF document text
    • http://bosurigazo.epizy.com/learning_styles_activity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69086cbc-5d6f-4577-8a5d-c72b9e3856d3/kuduvages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00769f99-9906-4e5b-9a7b-5d455a3e4fc7/mortal_engines_netflix_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bdb8566-a991-4ef0-957b-b4c75edbf00d/farmall_super_c_3_point_hitch_conversion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db3f9fae-a358-4a8e-9ae8-b0382b704149/gefuraxupatorusunitava.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_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 5468 bytes
SHA-256: 2ffc64144e4c0b9abf6221a6cce21410520aa12fcf3141e87e86a75a3d5a8f5e
font_01_sfnt_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 11120 bytes
SHA-256: 6783c1961f19668604de96ad064715b4e519764575fdc3c45c8cb2f719b2542c

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