Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b1a6fef0d25b87…

MALICIOUS

PDF

80.8 KB Created: 2021-02-16 11:49:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0c235b69f9a33696e2260a8e6e410f87 SHA-1: 9c6c59c0b2f1742fcf2d0248c29f019b46228ca1 SHA-256: 38b1a6fef0d25b876803f3413a4258318df5b3e07e762ed9e496c6252991ad4e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to drive traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=definicion+y+antecedentes+historicos+de+la+geometria+analitica PDF link annotation
    • https://kefomituwo.weebly.com/uploads/1/3/2/8/132815939/ladure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383170/normal_60021739bb2e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480893/normal_601a82b7a00d1.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/7068629.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/tetakaludexiv.pdfIn PDF document text
    • https://lolorude.weebly.com/uploads/1/3/0/7/130775760/2646e6eb4385a.pdfIn PDF document text
    • http://apple-fruit.space/wikugabonojirexasipuvokuacx.pdfIn PDF document text
    • https://lokawinopigu.weebly.com/uploads/1/3/2/7/132712062/6174234.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/vupego-viridibuvetuda.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/963ef0e399e842b.pdfIn PDF document text
    • http://begetus11ppz.xyz/94870117854p1gob.pdfIn PDF document text
    • https://ledatomonuv.weebly.com/uploads/1/3/4/6/134686063/805d71ad.pdfIn PDF document text
    • https://vejilete.weebly.com/uploads/1/3/5/3/135312445/fccb8d769d.pdfIn PDF document text
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/816994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390366/normal_5fe243da36608.pdfIn PDF document text
    • http://lazerepil.site/turefagifimilekoru1l5n.pdfIn PDF document text
    • http://istlan.space/discovering_the_lifespan_2nd_editionivmi8.pdfIn PDF document text
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/bukejuwike_dobesokedikilo_vunotekugefagu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/ccse_4_hall_ticket.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/anti-_terrorist_commando_mission_2019_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/dividing_fractions_by_whole_numbers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/zunowazadewejerorizu.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_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 5536 bytes
SHA-256: 1640eefeb6e722c26fb9dae23d9fdce8970a841065690216e0d107838f4a4e44
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 11900 bytes
SHA-256: 8e7e63b6dd2e10ca51ba905afe6981b365666dd79715f67fe00823744ffaaaf4