Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef59a937db9daa6f…

MALICIOUS

PDF

86.4 KB Created: 2021-03-01 02:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f7dfe265ca26f52ea69924e27f75d65e SHA-1: 9043f0756f61974d3b139d82159ae759d03ca328 SHA-256: ef59a937db9daa6f31c9787cfb286ea15659cbe6df8fb977c4b7ae41c340bb83
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=java+swing+example+application PDF link annotation
    • https://cdn.sqhk.co/sugezigo/hhBhjpd/91722902627.pdfIn PDF document text
    • http://italiahot.space/14649715028ev5sw.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/5UhhErK/junitedovejejininizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404753/normal_6023a84823aba.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/20557171040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_601f02c4e043c.pdfIn PDF document text
    • http://walletelectrum.buzz/craftsman_cost_bookbl939.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/20478687716.pdfIn PDF document text
    • http://legendbilisim.com/lewis_dot_structure_worksheet_answer_keys94nd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403417/normal_5ff36ee7c8d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_603040ff095a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475580/normal_603c2cab32a2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502819/normal_5fe4e746d6c97.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/1jiQSsx/download_ninja_hero_cats_mod_apk.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://s3.amazonaws.com/lazolu/custom_listview_in_android_abhiandroid.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/python_para_anlise_de_dados.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/olympus_camedia_e-_20n_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/44884786690.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 5156 bytes
SHA-256: e92d8bc3fc128c0a5444b15b2090f9ce2958bf4232e34846f5b5f16fa099aef8
font_01_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 12508 bytes
SHA-256: 9a8cb43211e40abe2a46f50c56890b5851aeb3a09f616c3913811161e40bbfb8
font_02_sfnt_off00013e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E24 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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