Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf6ca92fcc61493…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 16:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f44fd4a72d828c80bd3a4886d5d81dc SHA-1: d366a2d3b14ebd9d49deabdb34c5f5032e3803af SHA-256: faf6ca92fcc6149316dcccc97a16c7dfd9d9b60edc5244c2f77b583822ac2f86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users to download sites. The presence of these numerous, low-reputation URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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://pistant.ru/uplcv?utm_term=monster+of+glory+apk+download+for+android PDF link annotation
    • http://knupress.com/pds/editor/file/xujemaxojunulopalajuf.pdfIn PDF document text
    • http://cncsprings.com/d/files/36319138541.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/venovow.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/petuluba.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/28288951694.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/wugeve.pdfIn PDF document text
    • http://anninh247.info/upload/files/nulojexudenafen.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/1530138297.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/dewis.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/burilogifiwirixexi.pdfIn PDF document text
    • http://hkwwta.org/userfiles/tugurirewijupurune.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/lugefu.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/fozewiwadanane.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1632559803.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/34878387372.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/rurunuvukugi.pdfIn PDF document text
    • https://felicityokolo.com/file/52140951500.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614eda4701f15---tumevoto.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/rawiboxanupifox.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/ralemakabopefepava.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/61935385267.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/49204129293.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/59919401936.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB151 10956 bytes
SHA-256: 7be2a86efc53b4bf6d6779c3395bcbbef3c8d75568c6e0b31bdc69d7f6c328ae
font_01_sfnt_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 17516 bytes
SHA-256: 62c0913130bb57f63265a3961fb893803c9965bf4f341036dd05131621d5e2fc
font_02_sfnt_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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