Malicious PDF — malware analysis report

Static analysis result for SHA-256 10703f702cfc46db…

MALICIOUS

PDF

66.9 KB Created: 2020-12-18 07:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e0a2e3563f2412894675e00e78b92f07 SHA-1: 100d499dcf8ec192caa4e9e435e63651949d7e6a SHA-256: 10703f702cfc46dbf3a4b57e63ebb0a50ddc9b465057f1f77dd2821cf01cd7a4
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/strik?utm_term=note+taking+worksheet+electricity+section+1+electric+charge+answers PDF link annotation
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/6090789.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/kalajovomik.pdfIn PDF document text
    • https://fumotelam.weebly.com/uploads/1/3/4/7/134734881/7329022.pdfIn PDF document text
    • https://wagizubim.weebly.com/uploads/1/3/4/4/134470033/1004c984520db8.pdfIn PDF document text
    • https://fiwisiroveton.weebly.com/uploads/1/3/4/3/134339953/f5c9093.pdfIn PDF document text
    • https://vezaxudikofexi.weebly.com/uploads/1/3/4/6/134654587/vorigoxadul.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/geraromu/washington_air_quality_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a670f437-d9f4-40a8-9715-064ded943eb3/30647453917.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd308239b0722912b0841/t/5fc0f7a5bc819f1cf4fa6d0a/1606481829748/robert_murray_mccheyne_livros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491fccd6-0e77-4484-9c6c-fd5443560d2d/luzozadewurabuxiradiriw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/675a55a0-6553-4bfe-a2d7-99c09ddff3e6/11939017741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626e75b9-9f88-4a48-902b-e5f5b6606dc2/torerofubifova.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_off0000c6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D0 5340 bytes
SHA-256: 6737560afc8c01788d2f422b99098dd0ca4e8813462013560b1a3802427da1e2
font_01_sfnt_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 10880 bytes
SHA-256: 5ccc10a5dba2726b8573e51f43f593a37eaeb655d9579423c1a9885c587eac3d

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