Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1347310ef160171…

MALICIOUS

PDF

76.6 KB Created: 2021-03-11 22:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d33f89f417bb0558dbc45e6d5fc3c56c SHA-1: 66bae70ea6f20d922034e25bbee649c0aa60e633 SHA-256: d1347310ef1601718edebdbed47dd70d35473f9d67186149cb6ca201c38ac8e1
194 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, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=anhinga+trail+guided+tour PDF link annotation
    • http://cancandance.org/triangle_angle_bisectors_worksheet0ho8p.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/thchfhi/monkey_boxing_apk_android_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/f38r9Tt/88424004484.pdfIn PDF document text
    • https://ruvatekokero.weebly.com/uploads/1/3/1/4/131437102/4264002.pdfIn PDF document text
    • https://zofumevovuve.weebly.com/uploads/1/3/0/8/130874077/9821525.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/jonutazemazu.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/70996e5f238.pdfIn PDF document text
    • http://it50save.info/petrifilm_coliform_plates8pbd9.pdfIn PDF document text
    • https://zadujogor.weebly.com/uploads/1/3/1/4/131406982/kilorisikem.pdfIn PDF document text
    • http://mabay.fun/69908119108e11ix.pdfIn PDF document text
    • http://artyom.guru/189043790319sftx.pdfIn PDF document text
    • https://jowojebutoda.weebly.com/uploads/1/3/4/4/134487303/kaxoluzubefapeni.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/3209823.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/bakotezodug_kenul_mawona.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/jhV1jgg/dr_babasaheb_ambedkar_jayanti_2019_images.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/cVctKiu/506578565.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_0526b2d52242459687af5cf82d3dfc79.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_9bc47e3dbb914e0f806d227ff6f57945.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_d8cac0a6f010407c82759592a97e90b7.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_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 4900 bytes
SHA-256: d3974816a6a538eff80629aa4c2a72e4db23d32348c235574f934a19f9bbfd11
font_01_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 10964 bytes
SHA-256: df3dc93006d917e9a7f0dbb0884be000f67eceef0c23521e6cf2c404f33450cd

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