Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b9c448979c931e…

MALICIOUS

PDF

76.6 KB Created: 2021-03-14 12:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 520820d33df354234d23f3fe01ba8393 SHA-1: c89d96afc51046efec54d09fe8be665eb7246060 SHA-256: 81b9c448979c931e97103539dd732ff3041936b8d5dd45b8e0188a7b4ab07cfa
156 Risk Score

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 are SEO-optimized, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=blackfin+walkie+talkie+manual+wt-1003 PDF link annotation
    • http://bexixibeguben.sportsontheweb.net/62663799087.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/31678861801.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/lefemijip/batman_arkham_city_lockdown_para_android.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_e7e8ed8b69e542ed873e2fee023da808.pdf?index=trueIn PDF document text
    • http://kikanelomer.onlinewebshop.net/gadureson.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_186366af64e041239c1d1f904017e7f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/vespa_px_125_manual.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_de38264d9f824388b1996a3209f6ac3a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzed/67375182394.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/watevitadonoremaxaduru.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/98989828578.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/biwowazaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab6e89f-e540-4cac-8ff8-4f1dbdf706ee/smile_raina_telgemeier_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/dolefaresafoluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad81e3d-ee26-4ac5-897f-930673ba00a0/bushnell_voyager_sky_tour_telescope_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/can_i_do_istikhara_in_periods.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/cnet_adobe_reader.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_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 5348 bytes
SHA-256: 356a0665bbf28d950f2c06ce5ecea712ef018e2aac6cf725a60a7ae0ede750f3
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 11048 bytes
SHA-256: f61c6ae83d69fe32828a8afda1edf13e136cf45f66f15ad75a560881a5cb3574

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