Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e316f5faed8c7c…

MALICIOUS

PDF

38.5 KB Created: 2020-11-08 06:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a9848fb7edd756a4f46461fabbe3ef00 SHA-1: dbf1b1e56ba1cdc53d771db8cb9a5f2957a34faf SHA-256: 82e316f5faed8c7cd95855ba48a6dc45e2b31d629f693a9682497250e6ebe901
134 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 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 1.0000

Heuristics 6

  • 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/123?keyword=2.2+enrichment+and+extension+answers PDF link annotation
    • https://biwireteput.weebly.com/uploads/1/3/4/1/134131636/6303887.pdfIn PDF document text
    • https://fixoxotogixas.weebly.com/uploads/1/3/4/3/134374926/widewun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f874d4572ecd.pdfIn PDF document text
    • https://puxugewukuniw.weebly.com/uploads/1/3/4/4/134492634/laxepuluxojerug-pisoxawutok-mapoxutijap-fiperekibumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_5f9ddee589c6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_5f951721d8bf0.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/sovumuvidizisi.pdfIn PDF document text
    • https://vimugowome.weebly.com/uploads/1/3/4/3/134323071/1343743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e57af9-96db-4017-a307-c36bc9e0c2e8/98913099238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f05ec26e-4999-4a22-950b-ffee72fec234/vigikimerelulenelejaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5139f76-4f14-4fd5-9680-5103f5c1a569/jakotapu.pdfIn PDF document text
    • https://nekufinomo.files.wordpress.com/2020/11/rugizojupoz.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/23742810396.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_off000056ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56AC 5376 bytes
SHA-256: c1777bf77774970dda99f35d5dbb60225524daf20371810285240fbefebdcdab
font_01_sfnt_off000068dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DD 10764 bytes
SHA-256: 39abff0e086f137456d9f90b1f7c838575bd58860f8a07746ba6665e5cd2a2bb

Open this report in the interactive analyzer, or submit your own file for analysis.