Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e9c088e0aaf0ff…

MALICIOUS

PDF

73.6 KB Created: 2021-04-05 10:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 28fe28d4606374c002b417b3c350b31a SHA-1: 98250b6a44ca85a577e48877bfd9ff966b947d8f SHA-256: 90e9c088e0aaf0ff2939efe680f101d25c5e9fd407b745fe378dc2e90c6a181b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to direct users to malicious sites. The primary URL, https://lozipotod.ru/strik?utm_term=supportnintendo.com+error+code+2813, suggests a phishing attempt related to Nintendo support. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://lozipotod.ru/strik?utm_term=supportnintendo.com+error+code+2813 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474448/normal_603515152e9f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_600fc36bbec2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_60112878bb321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_60562e7eeb237.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/c1f19d904a440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_6016e02178088.pdfIn PDF document text
    • https://valefeka.weebly.com/uploads/1/3/5/3/135345526/340601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456989/normal_6041bf9cd609e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_600f4c608b784.pdfIn PDF document text
    • https://cdn.sqhk.co/gojikanemiju/jeiaics/liravukinabovilur.pdfIn PDF document text
    • https://logutidukikov.weebly.com/uploads/1/3/1/3/131380383/sexifixadimatin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_60381d114835a.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/ritufu.pdfIn PDF document text
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/vawot-ramewerimuz-ladobadopax.pdfIn PDF document text
    • https://finowizefi.weebly.com/uploads/1/3/1/3/131383614/8a9a4c2721.pdfIn PDF document text
    • https://woxawilafuzuve.weebly.com/uploads/1/3/4/6/134669094/dodisamewuluzute.pdfIn PDF document text
    • https://cdn.sqhk.co/duxajoje/LziHpgd/my_talking_cat_koko_mod_apk_rexdi._com.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/rolefosiju/16031926391.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/446712813.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/bernina_artlink_8.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_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 5476 bytes
SHA-256: e86d5f4da5af02f6f377904125833dbe5289d619527a548c13d04fee41dc56b2
font_01_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 10292 bytes
SHA-256: 430db9e56d7bd6a4196c3a4c4bfe8461ad8c92f6a460d0babfc1416736df3f2d

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