Malicious PDF — malware analysis report

Static analysis result for SHA-256 118544eb3896d03c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 11:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a24920918d9bcb731b3ba67cc4ba5621 SHA-1: a66cb7471218424d828f7e8df93902bc060c35d0 SHA-256: 118544eb3896d03cd2a0aaf4df474c16ba1bd4310cb004e1dd56ae4cfccea9b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs pointing to potentially malicious domains, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and heuristic firings point to a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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 http://nhuaduongnhapkhauaz.com/upload/files/zaxedexodubenono.pdf In PDF document text
    • https://jagamimpi.info/contents/files/digow.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/20453880022.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/44710417760.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/nopub.pdfIn PDF document text
    • http://juha.be/_files/file/fivususo.pdfIn PDF document text
    • http://blueyee.com/upload/file/070256327577.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109051146307354.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/guxozofimigub.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/25280391987.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109012326158207.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/58488913400.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/vefosagobijenixiwileraw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac48b32cb3---batevalawonatere.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/44769557290.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/maxagopaxanuzilotokipu.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/zikusotosinumo.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/80890666785.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/10141828377.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109081628545632.pdfIn PDF document text
    • http://synhbio.com/upload/files/72193265955.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/kenesudagarerel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=zuma+revenge+android+apkPDF 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_off0000c291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC291 17072 bytes
SHA-256: 065307cd1a0ff721aa1e95a06bc16d858ec06038c2443f9791a1a561cf1ec788
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 10644 bytes
SHA-256: e3da66f3d966d870a8440972a966f125907c89a0bad3114a64e468806f6b8e1d
font_02_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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