Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9201f13dee27f7…

MALICIOUS

PDF

75.4 KB Created: 2021-03-19 09:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 016dd8bce5770a1b18b5ae23306b1314 SHA-1: dd7122b22c99247e2084eb43c72b8dccfc7a679c SHA-256: aa9201f13dee27f7fb5d2df9b7a06a1c714ca22b3ea24feca385d11a193760fb
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/wix?keyword=diloreto+elementary+school+new+britain+ct PDF link annotation
    • http://remontnatali.ru/justin_guitar_music_theory_course4990j.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/kja9jat/argos_white_triple_bunk_beds.pdfIn PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/zipadafog.pdfIn PDF document text
    • https://cdn.sqhk.co/norejasiwiza/OzgQbjd/rizidomozajofufoxogel.pdfIn PDF document text
    • https://galevegu.weebly.com/uploads/1/3/4/5/134507196/9def7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501980/normal_603f13d81625e.pdfIn PDF document text
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/motela.pdfIn PDF document text
    • https://zelegurilu.weebly.com/uploads/1/3/1/3/131380871/5ffbcd5ce2.pdfIn PDF document text
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/5294ede116d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_5fd2dbe80a86e.pdfIn PDF document text
    • https://xanowiporak.weebly.com/uploads/1/3/0/8/130814060/nokanubojokab_jamodew.pdfIn PDF document text
    • http://reduslim-eu.site/72866989006r9feu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485015/normal_60073fa51e978.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/jbfiegc/caption_for_insta_pic_with_boyfriend.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416150/normal_5ff459c039dc3.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/nexanewikifosubu.pdfIn PDF document text
    • https://jaxuvoxet.weebly.com/uploads/1/3/5/9/135979876/wakabowuzimas.pdfIn PDF document text
    • https://gisoxesasolide.weebly.com/uploads/1/3/4/5/134590405/kuzaf.pdfIn PDF document text
    • https://dobuzitususuv.weebly.com/uploads/1/3/4/4/134470967/5257768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_ec5eb124c2b444b8b4afab08c2794fe1.pdf?index=trueIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_3149f123e0cb425f9568fcabb63db0c7.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_61d5b286c9684052823fbf4f8616446b.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_16e13b259b2a4a2dac7d8396e7ad1831.pdf?index=trueIn 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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 5372 bytes
SHA-256: e5a494d686f60c58339aa1f008732df303a941bd2863f27760cf11a9b53709ed
font_01_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 11092 bytes
SHA-256: c7e970e8ab7b84509faad69942954f8e4623fb8f8382042ebad26e52f19c5363