Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9d378903fa58d8…

MALICIOUS

PDF

81.7 KB Created: 2021-06-08 19:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8133de295f4122b8b0a3fd42fdee70e8 SHA-1: 3c0af100516c454f8c697c83bbf211a393f25adf SHA-256: 7e9d378903fa58d809505a0a7114c6dc18742aa350aedc968400f1aa5063a4b6
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 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. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chcial.ru/pbw?utm_term=tracing+letter+h+worksheets PDF link annotation
    • https://fatomokoke.weebly.com/uploads/1/3/4/0/134098041/legulisukige_gapopurulu_lupopariv.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/5771354.pdfIn PDF document text
    • https://vukaxibunima.weebly.com/uploads/1/3/4/8/134885707/tojulupi_wipuvamupudulow_vamiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fcf92ac42204.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/401747.pdfIn PDF document text
    • https://lonegaru.weebly.com/uploads/1/3/0/9/130969637/9a4025.pdfIn PDF document text
    • https://noruvejepemapab.weebly.com/uploads/1/3/4/7/134702548/8618022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_604460c10dbb2.pdfIn PDF document text
    • https://xejenusi.weebly.com/uploads/1/3/4/7/134762281/wefoxejifej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5fd926c99fdbf.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/judezevipegale_kuviwutuzenuv_xekiludefagok_rotilevego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_606a17be2a5de.pdfIn PDF document text
    • https://bomirilipaxotez.weebly.com/uploads/1/3/4/0/134096722/nafiwidi_mefowibopuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483361/normal_60563709e18d3.pdfIn PDF document text
    • https://gokaveruziniva.weebly.com/uploads/1/3/4/5/134580144/vigapinipomev_sanaz_kajis_latifefakoz.pdfIn PDF document text
    • https://tekikolunusujok.weebly.com/uploads/1/3/5/3/135304640/6720022.pdfIn PDF document text
    • https://metoxuxiduwano.weebly.com/uploads/1/3/1/6/131636764/levoporozirub.pdfIn PDF document text
    • https://bazojarazete.weebly.com/uploads/1/3/4/6/134650598/nejazefowemevosuvu.pdfIn PDF document text
    • https://kifikutomile.weebly.com/uploads/1/3/0/7/130776046/sesibedoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fatakalewene.pbworks.com/w/file/fetch/144504204/capitalismo_x_socialismo_x_comunismo_x_anarquismo.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/xexorusudapabogivelolixag.pdfIn PDF document text
    • http://dokadeku.pbworks.com/w/file/fetch/144829071/22276360389.pdfIn PDF document text
    • http://junerew.pbworks.com/f/wolomawopelimudekivipuw.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_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 5164 bytes
SHA-256: eb8ed8ea19d950990c2eebf8a15bdc672d37b38a88ed8d9a3861f88e85dd667a
font_01_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 10764 bytes
SHA-256: 9f903a5c54b16b46440f6714ef47373867305159bb5ac0856e7d198d668bde34