Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd905882f84e1e0…

MALICIOUS

PDF

75.0 KB Created: 2021-03-31 20:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1f5ebd048415ccf217158d9df952eb65 SHA-1: de68a0361e8814d5a75843ccb545210872780fe1 SHA-256: ffd905882f84e1e00ef1620725b7ea12d669b1faeeb11119deeafbe36aba8135
194 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure for 'geometry answers', indicating a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://druttle.ru/wix?keyword=3.6+geometry+answers PDF link annotation
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/sosamujukuvimet.pdfIn PDF document text
    • https://nogekapufininut.weebly.com/uploads/1/3/3/9/133997605/2961792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482018/normal_60097aecce40b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_600ed9855255d.pdfIn PDF document text
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/sixuwax.pdfIn PDF document text
    • https://murozukuzofapu.weebly.com/uploads/1/3/4/7/134716639/464375405c3e84.pdfIn PDF document text
    • https://valoxapemep.weebly.com/uploads/1/3/4/3/134305175/fegakowozesadideko.pdfIn PDF document text
    • https://bajewenizuku.weebly.com/uploads/1/3/4/4/134475359/4227c95e9.pdfIn PDF document text
    • https://modibidusez.weebly.com/uploads/1/3/4/0/134096811/zevemilowu.pdfIn PDF document text
    • https://dawipufa.weebly.com/uploads/1/3/3/9/133986453/suzubo.pdfIn PDF document text
    • https://penizamuravepu.weebly.com/uploads/1/3/5/9/135976181/9491fffa37.pdfIn PDF document text
    • https://junezafebu.weebly.com/uploads/1/3/0/8/130874287/loxuzigobet.pdfIn PDF document text
    • https://jubibololir.weebly.com/uploads/1/3/2/8/132814038/serim-jetenoguwevi-xotone-jiramawowo.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/pasutiz/ejemplo_de_un_manual_de_calidad_de_una_empresa_de_servicios.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/9806900670.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_2e19c507e02149d0a99fbfe42adb2c2b.pdf?index=trueIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_124fe51c570445e78e6b6a93f627b391.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/metodibosib.pdfIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_e00e593d458e4b0aa06384fe321bee62.pdf?index=trueIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_852dcb98ef0c43458ac23aefd8cdb840.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luborinizu/hp_p3015_quickspecs.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/confluence_macros_in_templates.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_e5333515995d47b2862a3acbe88c25e3.pdf?index=trueIn 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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 5420 bytes
SHA-256: 1905d5e7cedcc0e15f43f17669feec78efcc57e28e6b8bdbf863b9bb26e110fb
font_01_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 12396 bytes
SHA-256: 480ebfd6129d246c1776a59b2820221ab519d5a4cacbea6439c1ce3436a109ca

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