Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadefedbb10d9e5b…

MALICIOUS

PDF

77.8 KB Created: 2021-09-26 20:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e058d664c603559a7457776ebc3b1901 SHA-1: 0987f92bb59b2560937a423ef2174bfba1d181db SHA-256: aadefedbb10d9e5b162265ce136308a0ac6eb2d39d422fec18d9d6f7424ecb6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic identified it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bjxbw.cn/userfiles/file/lixoxuzoguwixe.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4bbe4ad6---79737310519.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/9570284922.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2c7cd1b6---buzenum.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/50609725492.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210909_191550.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/pifonejoja.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/14609425657.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/nitugejikemukuvuginur.pdfIn PDF document text
    • https://digireg.com/upload/62916560589.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/38353520415.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/35184357568.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614630d2b29e7---mimexesexiludeforedajeti.pdfIn PDF document text
    • http://taociren.com/upload/file/210910181457695376p02yv1d7i9rv.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/76960720082.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/95787893732.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/xazuxasagetovagugibipob.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/lufagekilevaxukupivoduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=solve+for+x+two+equationsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE15 19908 bytes
SHA-256: 89a1c5b9d35965dfa9d1fc92fb07cd71f706798cdcbd8ee3c72ece07c00e3cb7
font_01_sfnt_off0000e2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 10784 bytes
SHA-256: 22fdcbd11bb511bf27a1a52eaf6180da228f4abe63b683bbe87765d1802f82f5
font_02_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off000111b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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