Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17993aa5440d0cd…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 04:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8be95c7fb04a1d12a4379e871cc01f4 SHA-1: 2abb7bc8ce8bdc139f0b88b65f9967e479b519df SHA-256: d17993aa5440d0cd41a3c97065003423af86de06435619e4ee922ec0a6a1b4d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or scam campaign designed to redirect users to potentially harmful websites. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mimpiindahsatu.com/contents/files/76676648453.pdf In PDF document text
    • http://pro-customer.de/userfiles/file/13577687481.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/74340092382.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/82744666028.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/jiredutasetifibutamifar.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/90387268639.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/niwopulutobifinowubuk.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/5691529.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/68353846563.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/sexinezap.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/1388925119.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/temare.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/sopetazunegirob.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3030c1e46---razevozugeratojesov.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/lusofefir.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/lupademaxom.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/jilugedajisixetapar.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/39191064383.pdfIn PDF document text
    • http://360global.ca/userfiles/file/95398940456.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/93215465458.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/11579319210.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/4952704433.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/filoruvitavogipaf.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/janukitazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+sound+not+workingPDF link annotation
    • 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_off0000b1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 17252 bytes
SHA-256: a67ab722aafc46fb614a88eb05e51755323760d46df93a8eef2fb6cd1092d128
font_02_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 10344 bytes
SHA-256: 4a667665a5a2ffd6aaa761e652640f6ebcbfdd53412e93d6c9b49acda84c9e64

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