Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d582a1b542a368…

MALICIOUS

PDF

87.7 KB Created: 2021-02-28 02:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b0ea2147f20cb61307a13502543a2065 SHA-1: 32f76cdddb8cb38d3058bb8c00322815e81b46c8 SHA-256: 80d582a1b542a36830f9e033391e44b91995d718c8aff8f8dff0b07ed7faa000
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=vba+tutorial+pdf+2016 PDF link annotation
    • http://onlinesos.tech/60_day_notice_to_landlord_california_templatenj7jq.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/husqvarna_chainsaw_455_rancher_chain_brake.pdfIn PDF document text
    • https://pubogovivewata.weebly.com/uploads/1/3/2/3/132302724/dapibixo.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/81863099929.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/52839965278.pdfIn PDF document text
    • http://jopkapopka.online/jezajoxavasegtnxum.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/kfc_double_down_nutrition_uk.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/can_you_check_your_drivers_license_status_online_uk.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/606061628.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/36913148909.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/iphone_6_plus_used_price_in_egypt.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/digital_logic_design_textbook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorisenunajix.myartsonline.com/67812743645.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_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 5440 bytes
SHA-256: 49b9aad8a050115bbfc9f53b498e96f2433df37b660e111e4499ab38507340ab
font_01_sfnt_off00012c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C42 11056 bytes
SHA-256: 6a27996c09806671aa7642b115a0e7c6c9020b99a00f80c8657e5e39255e11f8

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