Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e918f9fef21dc0c…

MALICIOUS

PDF

77.2 KB Created: 2021-06-07 08:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ad7624d2628f84a72ac0af81dbd578ce SHA-1: 33ea370980442a572ad0f86760655f89e2ed2130 SHA-256: 6e918f9fef21dc0c81b1f82c1ab1b71334f00a9c1f2a260fd7c9c455d33bae35
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://midufefew.ru/123?utm_term=alto%2527+s+odyssey+mod+apk PDF link annotation
    • https://wevabubuked.weebly.com/uploads/1/3/4/5/134584052/fulip-lazumuf-sinedeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_604910a17e9c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fe9a995bf8c7.pdfIn PDF document text
    • https://xebexusutawa.weebly.com/uploads/1/3/4/5/134502291/9239892.pdfIn PDF document text
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/sawebapipu_kuxedovuzeb_kapelijotuxew.pdfIn PDF document text
    • https://vowuzuvave.weebly.com/uploads/1/3/4/8/134884034/dolisudamesaranatami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_606b68c7a43db.pdfIn PDF document text
    • https://momobalujinas.weebly.com/uploads/1/3/2/3/132303205/149f166c6aef.pdfIn PDF document text
    • https://xuwutofir.weebly.com/uploads/1/3/0/8/130813860/3286247.pdfIn PDF document text
    • https://nakeripa.weebly.com/uploads/1/3/2/8/132814262/1226d7ff2f27.pdfIn PDF document text
    • https://mazogerivajusem.weebly.com/uploads/1/3/4/3/134341978/fepet.pdfIn PDF document text
    • https://damelexivukek.weebly.com/uploads/1/3/4/7/134771288/00ebd9.pdfIn PDF document text
    • https://nogulakotu.weebly.com/uploads/1/3/0/9/130969216/pogelitofaf.pdfIn PDF document text
    • https://mexugagerow.weebly.com/uploads/1/3/4/4/134482965/rexed_newofe_gozusuboxuzo.pdfIn PDF document text
    • https://namoniwuxixipej.weebly.com/uploads/1/3/4/6/134606628/pivafe_dabiwe_garawu.pdfIn PDF document text
    • https://futikixuvezat.weebly.com/uploads/1/3/3/9/133986242/4baf805994449f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5ff0329e9b9c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427528/normal_6018441461f08.pdfIn PDF document text
    • https://fuguweraxawu.weebly.com/uploads/1/3/4/6/134684603/7036111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_603232b9a5584.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486997/normal_5fe213eb8f52f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_5fd196d4a604f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusuwoxub.pbworks.com/f/penny_stocks_to_buy_robinhood_reddit.pdfIn PDF document text
    • http://guvevef.pbworks.com/f/is_there_ever_going_to_be_another_percy_jackson_movie.pdfIn PDF document text
    • http://bijinim.pbworks.com/f/how_to_get_aimbot_on_krunker_2020.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_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 5196 bytes
SHA-256: 7026ed7d788da0163eec6e66ab2632c30ac7373fba0b7d73802c98c9f9b070f3
font_01_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 10484 bytes
SHA-256: b6c9ca12fc2ab85e0cf452a7a807733ece510a065f8a7e7d3502e46cf8187a0d