Malicious PDF — malware analysis report

Static analysis result for SHA-256 02e285560f257fd9…

MALICIOUS

PDF

87.8 KB Created: 2021-05-19 05:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b7e6024e5ef63e08350343749ae6755e SHA-1: 70d32a7a85288439bef570104311690f86ce9227 SHA-256: 02e285560f257fd94ea4a6aed7860756be2472e63f8e5844198fa1b59af98847
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://midufefew.ru/strik. While no scripts were extracted, the PDF structure and link farm behavior indicate a malicious intent 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://midufefew.ru/strik?utm_term=full+wave+rectifier+lab+manual+pdf PDF link annotation
    • https://xasugalepo.weebly.com/uploads/1/3/4/3/134311154/jadufimarotija.pdfIn PDF document text
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/samugipilamafab_bumukadap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377928/normal_5fcf44b79935f.pdfIn PDF document text
    • https://xudinenudomojuv.weebly.com/uploads/1/3/4/3/134356320/1092128.pdfIn PDF document text
    • https://jutamuxenaritul.weebly.com/uploads/1/3/1/4/131452982/8e7ae23d67.pdfIn PDF document text
    • https://jikizukudelo.weebly.com/uploads/1/3/4/8/134879768/zigifon_wizojipifij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_60026e4478d2b.pdfIn PDF document text
    • https://jokoturatel.weebly.com/uploads/1/3/5/9/135993825/5964243.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/vevotizelofi.pdfIn PDF document text
    • http://zugipipekuf.22web.org/samsung_6290_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_60338d0137f06.pdfIn PDF document text
    • http://vajejuzex.iblogger.org/vibefobamiro.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/208edf4e-f64a-4dc6-926a-25700ebe6049/what_are_the_sensory_details_used_in_descriptive_essays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a931ee9-4913-4089-a819-27be74146e1a/70074459424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8d9a80-24c5-4cd3-9301-d200c1bf684b/fisukagumaf.pdfIn PDF document text
    • http://lelurofu.rf.gd/83036078491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb187b2-c5a4-42e3-beae-b0bf93b37dfd/how_to_reset_my_fisher_paykel_dryer.pdfIn PDF document text
    • http://doketam.rf.gd/zudav.pdfIn PDF document text
    • http://rokopuma.epizy.com/proyecto_empresarial_plan_de_negocios_ejemplo_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e516e7-7788-46e5-91ed-31e10b5592b7/sonemagupuligigezida.pdfIn PDF document text
    • http://puxisozebipisal.rf.gd/riva_aquarama_plans.pdfIn PDF document text
    • http://dazidotidipo.rf.gd/zowegonekagejanazoramej.pdfIn PDF document text
    • http://banobozibijur.epizy.com/fefojizubelefog.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_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 5368 bytes
SHA-256: 82cc609aee996b9feab0f91d72d48efdbb45ecb12693ff02a6bf8100ea10a738
font_01_sfnt_off000129fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FE 11788 bytes
SHA-256: 495d376cf0a390c75ab51c7dbbe0b7171a2ca37c83472d0770e2fa6141c00c40