Malicious PDF — malware analysis report

Static analysis result for SHA-256 09211234ea03a5de…

MALICIOUS

PDF

76.1 KB Created: 2021-03-19 08:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af7f87f60fefd58eab367803f722254b SHA-1: 1920c5812a9baad1e5b221197d242874e0914378 SHA-256: 09211234ea03a5de5c93bea0150f538e8d1dc93a41f155946b40fb71726d6ded
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=books+never+written+worksheet+answers+5.9
    • https://cdn.sqhk.co/boxepupovemu/fn4RJdF/lowes_honda_pressure_washer_hose.pdf
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/xogusogi.pdf
    • http://dreamingdeveloper.com/what_are_the_8_stages_of_developmentcwkxq.pdf
    • https://cdn.sqhk.co/vewimidipiv/fqrjbia/minecraft_world_downloader_mod_1._8.pdf
    • http://mon-compte-cmb.best/gw2_huntsman_crafting_guide_1-_400h4n7r.pdf
    • https://zikazofikadit.weebly.com/uploads/1/3/0/7/130739129/lupuxuveloru.pdf
    • https://cdn-cms.f-static.net/uploads/4372982/normal_603a8a9a7bb79.pdf
    • https://cdn-cms.f-static.net/uploads/4456985/normal_5fdb8ddc74473.pdf
    • http://static-start.top/where_to_buy_saeco_coffee_machines4bf8k.pdf
    • https://cdn.sqhk.co/zenekukera/kjdjhje/zalanoram.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_54075e5ea00d4244af38cd9f7f3f04c2.pdf?index=true
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_1610d179d59b4a8286514b0921a5597a.pdf?index=true
    • https://s3.amazonaws.com/loranoduzuja/86992788250.pdf
    • https://s3.amazonaws.com/xeropizuwe/puvabo.pdf
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_d6322bee60af4d21b5a818eec0ae7761.pdf?index=true
    • https://s3.amazonaws.com/novifamigot/enhance_shaman_leveling_guide_classic.pdf
    • https://s3.amazonaws.com/xixonu/sovapigevane.pdf
    • https://s3.amazonaws.com/wujapu/6987884058.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_da030c9385c2477aae6c478e0400db00.pdf?index=true
    • 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_off0000eafb.bin
82d1a0a16188a82d15da1e8ece9713f1bdd8245acd027e44aed30a0ebc54327a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 5320 bytes
font_01_sfnt_off0000fd31.bin
ddacd93f52f11482d7a1c5dc0d2ac0afc51290f3b7e3a532214baf10211c5c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 11208 bytes

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